Update vendor code - Update markdown handler to use new CommonMark library

84 files changed, 2502 insertions, 817 deletions

diff --git a/vendor/league/commonmark-ext-table/CHANGELOG.md b/vendor/league/commonmark-ext-table/CHANGELOG.md
deleted file mode 100644
index 0616de81eb..0000000000
--- a/vendor/league/commonmark-ext-table/CHANGELOG.md
+++ /dev/null
@@ -1,138 +0,0 @@
-# Changelog
-
-All notable changes to this project will be documented in this file.
-
-The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
-and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
-
-## [Unreleased][unreleased]
-
-## [2.1.0] - 2019-09-26
-
-### Fixed
-
- - Fixed attributes being double-escaped (#31)
-
-## [2.0.0] - 2019-07-13
-
-### Changed
-
- - Changed the namespace to `League\CommonMark\Ext\Table`
- - Renamed `TableRows` to `TableSection`
- - Made the parser and renderers `final`
-
-### Removed
-
- - Removed the unused `TableRow::handleRemainingContents()` function
-
-## [1.0.0] - 2019-07-09
-### Changed
-
- - Increased minimum PHP version to 7.1
- - Updated to the commonmark 0.19 and 1.0
-
-### Removed
-
- - Removed support for commonmark 0.16, 0.17 and 0.18
-
-## [0.9.0] - 2018-11-28
-### Changed
-
- - Allowed the commonmark 0.18
-
-## [0.8.0] - 2018-01-24
-### Changed
-
- - Replaced align attribute with text-align style
-
-## [0.7.1] - 2018-01-23
-### Fixed
-
- - Fixed undefined method in commonmark 0.17
-
-## [0.7.0] - 2018-01-09
-### Changed
-
- - Increased minimum PHP version to 5.6
- - Updated to the commonmark 0.16 and 0.17 API
- 
-### Fixed
-
- - Fixed a problem with parsing whitespaces at the end of line
- 
-### Removed
-
- - Removed support for commonmark 0.14 and 0.15 API
-
-## [0.6.1] - 2017-01-11
-### Fixed
-
- - Fixed parsing of one column tables
-
-## [0.6.0] - 2016-09-26
-### Changed
- - Updated to the commonmark 0.15 API
- - Moved twig template to [webuni/commonmark-twig-renderer](https://packagist.org/packages/webuni/commonmark-twig-renderer)
-
-## [0.5.0] - 2016-07-13
-### Added
-
- - Added support for table caption (MultiMarkdown)
- - Added a template for twig renderer
-
-### Changed
-
- - Updated to the commonmark 0.14 API
-
-## [0.4.3] - 2016-01-14
-### Added
-
- - Added support for commonmark 0.13 API
-
-## [0.4.2] - 2015-11-05
-### Added
-
- - Added support for commonmark 0.12 API
-
-## [0.4.1] - 2015-09-22
-### Added
-
- - Added missing tests
-
-## [0.4.0] - 2015-09-21
-### Changed
-
- - Updated to the new commonmark 0.11 API
-
-## [0.3.0] - 2015-07-27
-### Added
-
- - Added support for custom attributes in renderers
-
-## [0.2.0] - 2015-07-27
-### Changed
-
- - Updated to the new commonmark 0.10 API
-
-## [0.1.0] - 2015-06-24
-### Added
- - Implemented GFM tables
-
-[unreleased]: https://github.com/thephpleague/commonmark-ext-table/compare/v2.1.0...HEAD
-[2.1.0]: https://github.com/thephpleague/commonmark-ext-table/compare/v2.0.0...v2.1.0
-[2.0.0]: https://github.com/thephpleague/commonmark-ext-table/compare/1.0.0...v2.0.0
-[1.0.0]: https://github.com/thephpleague/commonmark-ext-table/compare/0.9.0...1.0.0
-[0.9.0]: https://github.com/thephpleague/commonmark-ext-table/compare/0.8.0...0.9.0
-[0.8.0]: https://github.com/thephpleague/commonmark-ext-table/compare/0.7.1...0.8.0
-[0.7.1]: https://github.com/thephpleague/commonmark-ext-table/compare/0.7.0...0.7.1
-[0.7.0]: https://github.com/thephpleague/commonmark-ext-table/compare/0.6.1...0.7.0
-[0.6.1]: https://github.com/thephpleague/commonmark-ext-table/compare/0.6.0...0.6.1
-[0.6.0]: https://github.com/thephpleague/commonmark-ext-table/compare/0.5.0...0.6.0
-[0.5.0]: https://github.com/thephpleague/commonmark-ext-table/compare/0.4.3...0.5.0
-[0.4.3]: https://github.com/thephpleague/commonmark-ext-table/compare/0.4.2...0.4.3
-[0.4.2]: https://github.com/thephpleague/commonmark-ext-table/compare/0.4.1...0.4.2
-[0.4.1]: https://github.com/thephpleague/commonmark-ext-table/compare/0.4.0...0.4.1
-[0.4.0]: https://github.com/thephpleague/commonmark-ext-table/compare/0.3.0...0.4.0
-[0.3.0]: https://github.com/thephpleague/commonmark-ext-table/compare/0.2.0...0.3.0
-[0.2.0]: https://github.com/thephpleague/commonmark-ext-table/compare/0.1.0...0.2.0
-[0.1.0]: https://github.com/thephpleague/commonmark-ext-table/commits/0.1.0
diff --git a/vendor/league/commonmark-ext-table/LICENSE b/vendor/league/commonmark-ext-table/LICENSE
deleted file mode 100644
index 522628ac93..0000000000
--- a/vendor/league/commonmark-ext-table/LICENSE
+++ /dev/null
@@ -1,19 +0,0 @@
-Copyright (c) Martin Hasoň <martin.hason@gmail.com>, Colin O'Dell <colinodell@gmail.com>
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
diff --git a/vendor/league/commonmark-ext-table/README.md b/vendor/league/commonmark-ext-table/README.md
deleted file mode 100644
index 4612bc3cd6..0000000000
--- a/vendor/league/commonmark-ext-table/README.md
+++ /dev/null
@@ -1,152 +0,0 @@
-CommonMark Table Extension
-==========================
-
-[![Latest Version](https://img.shields.io/packagist/v/league/commonmark-ext-table.svg?style=flat-square)](https://packagist.org/packages/league/commonmark-ext-table)
-[![Build Status](https://img.shields.io/travis/thephpleague/commonmark-ext-table.svg?style=flat-square)](https://travis-ci.org/thephpleague/commonmark-ext-table)
-[![Code Quality](https://img.shields.io/scrutinizer/g/thephpleague/commonmark-ext-table.svg?style=flat-square)](https://scrutinizer-ci.com/g/thephpleague/commonmark-ext-table/code-structure)
-[![Code Coverage](https://img.shields.io/scrutinizer/coverage/g/thephpleague/commonmark-ext-table.svg?style=flat-square)](https://scrutinizer-ci.com/g/thephpleague/commonmark-ext-table)
-
-The Table extension adds the ability to create tables in CommonMark documents.
-
-Installation
-------------
-
-This project can be installed via Composer:
-
-    composer require league/commonmark-ext-table
-
-Usage
------
-
-Configure your `Environment` as usual and simply add the `TableExtension` provided by this package:
-
-```php
-use League\CommonMark\Converter;
-use League\CommonMark\DocParser;
-use League\CommonMark\Environment;
-use League\CommonMark\HtmlRenderer;
-use League\CommonMark\Ext\Table\TableExtension;
-
-// Obtain a pre-configured Environment with all the standard CommonMark parsers/renderers ready-to-go
-$environment = Environment::createCommonMarkEnvironment();
-
-// Add this extension
-$environment->addExtension(new TableExtension());
-
-// Instantiate the converter engine and start converting some Markdown!
-$converter = new Converter(new DocParser($environment), new HtmlRenderer($environment));
-
-echo $converter->convertToHtml('# Hello World!');
-```
-
-Syntax
-------
-
-This package is fully compatible with GFM-style tables:
-
-### Simple
-
-Code:
-```markdown
-th | th(center) | th(right)
----|:----------:|----------:
-td | td         | td
-```
-
-Result:
-```html
-<table>
-<thead>
-<tr>
-<th style="text-align: left">th</th>
-<th style="text-align: center">th(center)</th>
-<th style="text-align: right">th(right<)/th>
-</tr>
-</thead>
-<tbody>
-<tr>
-<td style="text-align: left">td</td>
-<td style="text-align: center">td</td>
-<td style="text-align: right">td</td>
-</tr>
-</tbody>
-</table>
-```
-
-### Advanced
-
-```markdown
-| header 1 | header 2 | header 2 |
-| :------- | :------: | -------: |
-| cell 1.1 | cell 1.2 | cell 1.3 |
-| cell 2.1 | cell 2.2 | cell 2.3 |
-```
-
-### Table caption
-
-```markdown
-header 1 | header 2
--------- | --------
-cell 1.1 | cell 1.2
-[Simple table]
-```
-
-Code:
-```markdown
-header 1 | header 2
--------- | --------
-cell 1.1 | cell 1.2
-[*Prototype* table][reference_table]
-```
-
-Result:
-```html
-<table>
-<caption id="reference_table"><em>Prototype</em> table</caption>
-<thead>
-<tr>
-<th>header 1</th>
-<th>header 2</th>
-</tr>
-</thead>
-<tbody>
-<tr>
-<td>cell 1.1</td>
-<td>cell 1.2</td>
-</tr>
-</tbody>
-</table>
-<table>
-```
-
-Changelog
----------
-
-Please refer to the [CHANGELOG](CHANGELOG.md) for more information on what has changed recently.
-
-Development
------------
-
-You need to have *php* or *docker* installed to develop the library. To list all available commands run:
-
-```bash
-./run
-```
-
-Security
---------
-
-If you discover any security related issues, please email colinodell@gmail.com instead of using the issue tracker.
-
-Credits
--------
-
-- [Martin Hasoň](https://github.com/hason)
-- [Webuni s.r.o.](https://www.webuni.cz)
-- [Colin O'Dell](https://github.com/colinodell)
-- [All Contributors](../../contributors)
-
-License
--------
-
-This library is licensed under the MIT license.  See the [License File](LICENSE) for more information.
diff --git a/vendor/league/commonmark-ext-table/composer.json b/vendor/league/commonmark-ext-table/composer.json
deleted file mode 100644
index 9689c501b1..0000000000
--- a/vendor/league/commonmark-ext-table/composer.json
+++ /dev/null
@@ -1,54 +0,0 @@
-{
-    "name": "league/commonmark-ext-table",
-    "type": "commonmark-extension",
-    "description": "Table extension for league/commonmark",
-    "keywords": ["markdown", "commonmark", "extension", "table"],
-    "homepage": "https://github.com/thephpleague/commonmark-ext-table",
-    "license": "MIT",
-    "authors": [
-        {
-            "name": "Martin Hasoň",
-            "email": "martin.hason@gmail.com"
-        },
-        {
-            "name": "Webuni s.r.o.",
-            "homepage": "https://www.webuni.cz"
-        },
-        {
-            "name": "Colin O'Dell",
-            "email": "colinodell@gmail.com",
-            "homepage": "https://www.colinodell.com"
-        }
-    ],
-    "require": {
-        "php": "^7.1",
-        "league/commonmark": "~0.19.3|^1.0"
-    },
-    "require-dev": {
-        "phpstan/phpstan": "~0.11",
-        "phpunit/phpunit": "^7.0|^8.0",
-        "vimeo/psalm": "^3.0",
-        "friendsofphp/php-cs-fixer": "^2.14",
-        "symfony/var-dumper": "^4.0"
-    },
-    "autoload": {
-        "psr-4": {
-            "League\\CommonMark\\Ext\\Table\\": "src"
-        }
-    },
-    "scripts": {
-        "test": ["@phpunit", "@phpstan", "@psalm"],
-        "phpstan": "phpstan analyse -l7 src",
-        "phpunit": "phpunit",
-        "psalm": "psalm",
-        "cs-fix": "php-cs-fixer fix --allow-risky=yes"
-    },
-    "config": {
-        "preferred-install": "dist"
-    },
-    "extra": {
-        "branch-alias": {
-            "dev-master": "2.2-dev"
-        }
-    }
-}
diff --git a/vendor/league/commonmark-ext-table/run b/vendor/league/commonmark-ext-table/run
deleted file mode 100755
index b7d570457d..0000000000
--- a/vendor/league/commonmark-ext-table/run
+++ /dev/null
@@ -1,43 +0,0 @@
-#!/usr/bin/env sh
-set -e
-
-url="https://raw.githubusercontent.com/webuni/shell-task-runner/master/runner"
-[ -f ./.runner ] || wget -q "$url" -O- > .runner || curl -fso .runner "$url"
-. ./.runner
-
-! mkdir -p $HOME/.composer/cache
-if [ ! -f $HOME/.composer/auth.json ]; then echo "{}" > $HOME/.composer/auth.json; fi
-
-_decorator()(
-    if [ -n "$(command -v docker)" ]; then
-        _docker_run -v "$HOME/.composer/cache:/composer-cache" -v "$HOME/.composer/auth.json:/composer/auth.json" webuni/php:7.3 ./run "$@"
-    else
-        "$@"
-    fi
-)
-
-# Install dependencies
-task_deps()(
-    composer install
-)
-
-# Static analyse
-task_analyse()(
-    ./vendor/bin/phpstan analyse -l7 src "$@"
-    ./vendor/bin/psalm
-)
-
-# Run composer
-task_composer()(
-      composer "$@"
-)
-
-# Fix code style
-task_cs_fix()(
-    ./vendor/bin/php-cs-fixer fix --allow-risky=yes "$@"
-)
-
-# Run tests
-task_tests()(
-    ./vendor/bin/phpunit "$@"
-)
diff --git a/vendor/league/commonmark-ext-table/src/TableCaption.php b/vendor/league/commonmark-ext-table/src/TableCaption.php
deleted file mode 100644
index b488eb8b3c..0000000000
--- a/vendor/league/commonmark-ext-table/src/TableCaption.php
+++ /dev/null
@@ -1,53 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-/*
- * This is part of the league/commonmark-ext-table package.
- *
- * (c) Martin Hasoň <martin.hason@gmail.com>
- * (c) Webuni s.r.o. <info@webuni.cz>
- * (c) Colin O'Dell <colinodell@gmail.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace League\CommonMark\Ext\Table;
-
-use League\CommonMark\Block\Element\AbstractBlock;
-use League\CommonMark\Block\Element\AbstractStringContainerBlock;
-use League\CommonMark\Block\Element\InlineContainerInterface;
-use League\CommonMark\ContextInterface;
-use League\CommonMark\Cursor;
-
-class TableCaption extends AbstractStringContainerBlock implements InlineContainerInterface
-{
-    public $id;
-
-    public function __construct(string $caption, string $id = null)
-    {
-        parent::__construct();
-        $this->finalStringContents = $caption;
-        $this->id = $id;
-    }
-
-    public function canContain(AbstractBlock $block): bool
-    {
-        return false;
-    }
-
-    public function isCode(): bool
-    {
-        return false;
-    }
-
-    public function matchesNextLine(Cursor $cursor): bool
-    {
-        return false;
-    }
-
-    public function handleRemainingContents(ContextInterface $context, Cursor $cursor): void
-    {
-    }
-}
diff --git a/vendor/league/commonmark-ext-table/src/TableCaptionRenderer.php b/vendor/league/commonmark-ext-table/src/TableCaptionRenderer.php
deleted file mode 100644
index a02a0bbd75..0000000000
--- a/vendor/league/commonmark-ext-table/src/TableCaptionRenderer.php
+++ /dev/null
@@ -1,39 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-/*
- * This is part of the league/commonmark-ext-table package.
- *
- * (c) Martin Hasoň <martin.hason@gmail.com>
- * (c) Webuni s.r.o. <info@webuni.cz>
- * (c) Colin O'Dell <colinodell@gmail.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace League\CommonMark\Ext\Table;
-
-use League\CommonMark\Block\Element\AbstractBlock;
-use League\CommonMark\Block\Renderer\BlockRendererInterface;
-use League\CommonMark\ElementRendererInterface;
-use League\CommonMark\HtmlElement;
-
-final class TableCaptionRenderer implements BlockRendererInterface
-{
-    public function render(AbstractBlock $block, ElementRendererInterface $htmlRenderer, bool $inTightList = false)
-    {
-        if (!$block instanceof TableCaption) {
-            throw new \InvalidArgumentException('Incompatible block type: '.get_class($block));
-        }
-
-        $attrs = $block->getData('attributes', []);
-
-        if ($block->id) {
-            $attrs['id'] = $block->id;
-        }
-
-        return new HtmlElement('caption', $attrs, $htmlRenderer->renderInlines($block->children()));
-    }
-}
diff --git a/vendor/league/commonmark-ext-table/src/TableParser.php b/vendor/league/commonmark-ext-table/src/TableParser.php
deleted file mode 100644
index 63d173f332..0000000000
--- a/vendor/league/commonmark-ext-table/src/TableParser.php
+++ /dev/null
@@ -1,147 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-/*
- * This is part of the league/commonmark-ext-table package.
- *
- * (c) Martin Hasoň <martin.hason@gmail.com>
- * (c) Webuni s.r.o. <info@webuni.cz>
- * (c) Colin O'Dell <colinodell@gmail.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace League\CommonMark\Ext\Table;
-
-use League\CommonMark\Block\Element\Paragraph;
-use League\CommonMark\Block\Parser\BlockParserInterface;
-use League\CommonMark\ContextInterface;
-use League\CommonMark\Cursor;
-use League\CommonMark\Util\RegexHelper;
-
-final class TableParser implements BlockParserInterface
-{
-    const REGEXP_DEFINITION = '/(?: *(:?) *-+ *(:?) *)+(?=\||$)/';
-    const REGEXP_CELLS = '/(?:`[^`]*`|\\\\\||\\\\|[^|`\\\\]+)+(?=\||$)/';
-    const REGEXP_CAPTION = '/^\[(.+?)\](?:\[(.+)\])?\s*$/';
-
-    public function parse(ContextInterface $context, Cursor $cursor): bool
-    {
-        $container = $context->getContainer();
-
-        if (!$container instanceof Paragraph) {
-            return false;
-        }
-
-        $lines = $container->getStrings();
-        if (count($lines) < 1) {
-            return false;
-        }
-
-        $expressionOffset = $cursor->getNextNonSpacePosition();
-
-        $match = RegexHelper::matchAll(self::REGEXP_DEFINITION, $cursor->getLine(), $expressionOffset);
-        if (null === $match) {
-            return false;
-        }
-
-        $columns = $this->parseColumns($match);
-        $head = $this->parseRow(trim((string) array_pop($lines)), $columns, TableCell::TYPE_HEAD);
-        if (null === $head) {
-            return false;
-        }
-
-        $table = new Table(function (Cursor $cursor, Table $table) use ($columns): bool {
-            $row = $this->parseRow($cursor->getLine(), $columns);
-            if (null === $row) {
-                if (null !== $table->getCaption()) {
-                    return false;
-                }
-
-                if (null !== ($caption = $this->parseCaption($cursor->getLine()))) {
-                    $table->setCaption($caption);
-
-                    return true;
-                }
-
-                return false;
-            }
-
-            $table->getBody()->appendChild($row);
-
-            return true;
-        });
-
-        $table->getHead()->appendChild($head);
-
-        if (count($lines) >= 1) {
-            $paragraph = new Paragraph();
-            foreach ($lines as $line) {
-                $paragraph->addLine($line);
-            }
-
-            $context->replaceContainerBlock($paragraph);
-            $context->addBlock($table);
-        } else {
-            $context->replaceContainerBlock($table);
-        }
-
-        return true;
-    }
-
-    private function parseColumns(array $match): array
-    {
-        $columns = [];
-        foreach ((array) $match[0] as $i => $column) {
-            if (isset($match[1][$i]) && $match[1][$i] && isset($match[2][$i]) && $match[2][$i]) {
-                $columns[] = TableCell::ALIGN_CENTER;
-            } elseif (isset($match[1][$i]) && $match[1][$i]) {
-                $columns[] = TableCell::ALIGN_LEFT;
-            } elseif (isset($match[2][$i]) && $match[2][$i]) {
-                $columns[] = TableCell::ALIGN_RIGHT;
-            } else {
-                $columns[] = '';
-            }
-        }
-
-        return $columns;
-    }
-
-    private function parseRow(string $line, array $columns, string $type = TableCell::TYPE_BODY): ?TableRow
-    {
-        $cells = RegexHelper::matchAll(self::REGEXP_CELLS, $line);
-
-        if (null === $cells || $line === $cells[0]) {
-            return null;
-        }
-
-        $i = 0;
-        $row = new TableRow();
-        foreach ((array) $cells[0] as $i => $cell) {
-            if (!isset($columns[$i])) {
-                return $row;
-            }
-
-            $row->appendChild(new TableCell(trim($cell), $type, isset($columns[$i]) ? $columns[$i] : null));
-        }
-
-        for ($j = count($columns) - 1; $j > $i; --$j) {
-            $row->appendChild(new TableCell('', $type, null));
-        }
-
-        return $row;
-    }
-
-    private function parseCaption(string $line): ?TableCaption
-    {
-        $caption = RegexHelper::matchAll(self::REGEXP_CAPTION, $line);
-
-        if (null === $caption) {
-            return null;
-        }
-
-        return new TableCaption($caption[1], $caption[2]);
-    }
-}
diff --git a/vendor/league/commonmark/.editorconfig b/vendor/league/commonmark/.editorconfig
new file mode 100644
index 0000000000..6923a8d414
--- /dev/null
+++ b/vendor/league/commonmark/.editorconfig
@@ -0,0 +1,14 @@
+; top-most EditorConfig file
+root = true
+
+# All files.
+[*]
+end_of_line = LF
+indent_style = space
+indent_size = 4
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[.travis.yml]
+indent_size = 2
diff --git a/vendor/league/commonmark/.phpstorm.meta.php b/vendor/league/commonmark/.phpstorm.meta.php
index e797ee11b7..d37ba2801f 100644
--- a/vendor/league/commonmark/.phpstorm.meta.php
+++ b/vendor/league/commonmark/.phpstorm.meta.php
@@ -28,7 +28,7 @@ namespace PHPSTORM_META
     expectedArguments(\League\CommonMark\Inline\Element\Newline::__construct(), 0, argumentsSet('league_commonmark_newline_types'));
     expectedReturnValues(\League\CommonMark\Inline\Element\Newline::getType(), argumentsSet('league_commonmark_newline_types'));
 
-    registerArgumentsSet('league_commonmark_options', 'renderer', 'enable_em', 'enable_strong', 'use_asterisk', 'use_underscore', 'html_input', 'allow_unsafe_links', 'max_nesting_level');
+    registerArgumentsSet('league_commonmark_options', 'renderer', 'enable_em', 'enable_strong', 'use_asterisk', 'use_underscore', 'unordered_list_markers', 'html_input', 'allow_unsafe_links', 'max_nesting_level');
     expectedArguments(\League\CommonMark\EnvironmentInterface::getConfig(), 0, argumentsSet('league_commonmark_options'));
     expectedArguments(\League\CommonMark\Util\ConfigurationInterface::get(), 0, argumentsSet('league_commonmark_options'));
     expectedArguments(\League\CommonMark\Util\ConfigurationInterface::set(), 0, argumentsSet('league_commonmark_options'));
diff --git a/vendor/league/commonmark/CHANGELOG.md b/vendor/league/commonmark/CHANGELOG.md
index eaa424c8a6..2d661b9fa9 100644
--- a/vendor/league/commonmark/CHANGELOG.md
+++ b/vendor/league/commonmark/CHANGELOG.md
@@ -4,6 +4,38 @@ Updates should follow the [Keep a CHANGELOG](https://keepachangelog.com/) princi
 
 ## [Unreleased][unreleased]
 
+## [1.3.0] - 2020-02-08
+
+### Added
+
+ - Added (optional) **full GFM support!** 🎉🎉🎉 (#409)
+ - Added check to ensure Markdown input is valid UTF-8 (#401, #405)
+ - Added new `unordered_list_markers` configuration option (#408, #411)
+
+### Changed
+
+ - Introduced several micro-optimizations for a 5-10% performance boost
+
+## [1.2.2] - 2020-01-15
+
+This release contains the same changes as 1.1.3:
+
+### Fixed
+
+ - Fixed link parsing edge case (#403)
+
+## [1.1.3] - 2020-01-15
+
+### Fixed
+
+ - Fixed link parsing edge case (#403)
+
+## [1.2.1] - 2020-01-14
+
+### Changed
+
+ - Introduced several micro-optimizations, reducing the parse time by 8%
+
 ## [1.2.0] - 2020-01-09
 
 ### Changed
@@ -187,8 +219,12 @@ No changes were made since 1.0.0-rc1.
    - Removed `DelimiterStack::iterateByCharacters()` (use the new `processDelimiters()` method instead)
    - Removed the protected `DelimiterStack::findMatchingOpener()` method
 
-[unreleased]: https://github.com/thephpleague/commonmark/compare/1.2.0...HEAD
+[unreleased]: https://github.com/thephpleague/commonmark/compare/1.3.0...HEAD
+[1.3.0]: https://github.com/thephpleague/commonmark/compare/1.2.2...1.3.0
+[1.2.2]: https://github.com/thephpleague/commonmark/compare/1.2.1...1.2.2
+[1.2.1]: https://github.com/thephpleague/commonmark/compare/1.2.0...1.2.1
 [1.2.0]: https://github.com/thephpleague/commonmark/compare/1.1.2...1.2.0
+[1.1.3]: https://github.com/thephpleague/commonmark/compare/1.1.2...1.1.3
 [1.1.2]: https://github.com/thephpleague/commonmark/compare/1.1.1...1.1.2
 [1.1.1]: https://github.com/thephpleague/commonmark/compare/1.1.0...1.1.1
 [1.1.0]: https://github.com/thephpleague/commonmark/compare/1.0.0...1.1.0
diff --git a/vendor/league/commonmark/README.md b/vendor/league/commonmark/README.md
index 4732b88c36..33a3e59869 100644
--- a/vendor/league/commonmark/README.md
+++ b/vendor/league/commonmark/README.md
@@ -12,11 +12,11 @@
 
 ![league/commonmark](commonmark-banner.png)
 
-**league/commonmark** is a highly-extensible PHP Markdown parser created by [Colin O'Dell][@colinodell] which supports the full [CommonMark] spec.  It is based on the [CommonMark JS reference implementation][commonmark.js] by [John MacFarlane] \([@jgm]\).
+**league/commonmark** is a highly-extensible PHP Markdown parser created by [Colin O'Dell][@colinodell] which supports the full [CommonMark] spec and [Github-Flavored Markdown].  It is based on the [CommonMark JS reference implementation][commonmark.js] by [John MacFarlane] \([@jgm]\).
 
 ## 📦 Installation & Basic Usage
 
-This project can be installed via [Composer]:
+This project requires PHP 7.1 or higher with the `mbstring` extension.  To install it via [Composer] simply run:
 
 ``` bash
 $ composer require league/commonmark
@@ -37,6 +37,21 @@ echo $converter->convertToHtml('# Hello World!');
 // <h1>Hello World!</h1>
 ```
 
+Or if you want Github-Flavored Markdown, use the `GithubFlavoredMarkdownConverter` class instead:
+
+```php
+use League\CommonMark\GithubFlavoredMarkdownConverter;
+
+$converter = new GithubFlavoredMarkdownConverter([
+    'html_input' => 'strip',
+    'allow_unsafe_links' => false,
+]);
+
+echo $converter->convertToHtml('# Hello World!');
+
+// <h1>Hello World!</h1>
+```
+
 Please note that only UTF-8 and ASCII encodings are supported.  If your Markdown uses a different encoding please convert it to UTF-8 before running it through this library.
 
 🔒 If you will be parsing untrusted input from users, please consider setting the `html_input` and `allow_unsafe_links` options per the example above. See <https://commonmark.thephpleague.com/security/> for more details. If you also do choose to allow raw HTML input from untrusted users, considering using a library (like [HTML Purifier](https://github.com/ezyang/htmlpurifier)) to provide additional HTML filtering.
@@ -49,6 +64,18 @@ Full documentation on advanced usage, configuration, and customization can be fo
 
 Information on how to upgrade to newer versions of this library can be found at <https://commonmark.thephpleague.com/releases>.
 
+## 💻 Github-Flavored Markdown
+
+The `GithubFlavoredMarkdownConverter` shown earlier is a drop-in replacement for the `CommonMarkConverter` which adds additional features found in the GFM spec:
+
+ - Autolinks
+ - Disallowed raw HTML
+ - Strikethrough
+ - Tables
+ - Task Lists
+
+See the [Extensions documentation](https://commonmark.thephpleague.com/1.0/customization/extensions/) for more details on how to include only certain GFM features if you don't want them all.
+
 ## 🗃️ Related Packages
 
 ### Integrations
@@ -62,24 +89,9 @@ Information on how to upgrade to newer versions of this library can be found at
 - [Twig Markdown extension](https://github.com/twigphp/markdown-extension)
 - [Twig filter and tag](https://github.com/aptoma/twig-markdown)
 
-### GFM Extensions
-
-You can easily add support for Github-Flavored Markdown by installing the [`league/commonmark-extras`](https://github.com/thephpleague/commonmark-extras) package, which includes bundles all of the extensions listed below:
+### Included Extensions
 
-| Feature | Package Name | Description |
-| ------- | ------------ | ----------- |
-| Autolinks | [`league/commonmark-ext-autolink`](https://github.com/thephpleague/commonmark-ext-autolink) | Automatically links URLs, emails, and (optionally) @-mentions without needing to use `<...>` |
-| Smart Punctuation | [`league/commonmark-ext-smartpunct`](https://github.com/thephpleague/commonmark-ext-smartpunct) | Intelligently converts ASCII quotes, dashes, and ellipses to their Unicode equivalents |
-| Strikethrough | [`league/commonmark-ext-strikethrough`](https://github.com/thephpleague/commonmark-ext-strikethrough) | Adds support for `~~strikethrough~~` syntax |
-| Task Lists | [`league/commonmark-ext-task-list`](https://github.com/thephpleague/commonmark-ext-task-list) | Support for Github-style task lists |
-| Tables | [`league/commonmark-ext-table`](https://github.com/thephpleague/commonmark-ext-table) | GFM-style tables |
-
-### Other PHP League Extensions
-
- - [`league/commonmark-ext-inlines-only`](https://github.com/thephpleague/commonmark-ext-inlines-only) - Renders inline text without paragraph tags or other block-level elements
- - [`league/commonmark-ext-external-link`](https://github.com/thephpleague/commonmark-ext-external-link) - Mark external links, make them open in new windows, etc.
-
-You can add them to your project or use them as examples to [develop your own custom features](https://commonmark.thephpleague.com/customization/overview/).
+See [our extension documentation](https://commonmark.thephpleague.com/1.0/customization/extensions/#included-extensions) for a full list of extensions bundled with this library.
 
 ### Community Extensions
 
@@ -174,6 +186,10 @@ Are you interested in sponsoring development of this project? [Make a pledge](ht
 
 This project is primarily maintained by [Colin O'Dell][@colinodell].  Members of the [PHP League] Leadership Team may occasionally assist with some of these duties.
 
+## 🗺️  Who Uses It?
+
+This project is used by [Laravel Framework](https://laravel.com/), [Cachet](https://cachethq.io/), [Firefly III](https://firefly-iii.org/), [Neos](https://www.neos.io/), [Daux.io](https://daux.io/), and [more](https://packagist.org/packages/league/commonmark/dependents)!
+
 ---
 
 <div align="center">
@@ -189,6 +205,7 @@ This project is primarily maintained by [Colin O'Dell][@colinodell].  Members of
 [CommonMark]: http://commonmark.org/
 [CommonMark spec]: http://spec.commonmark.org/
 [commonmark.js]: https://github.com/jgm/commonmark.js
+[Github-Flavored Markdown]: https://github.github.com/gfm/
 [John MacFarlane]: http://johnmacfarlane.net
 [docs]: https://commonmark.thephpleague.com/
 [docs-examples]: https://commonmark.thephpleague.com/customization/overview/#examples
diff --git a/vendor/league/commonmark/composer.json b/vendor/league/commonmark/composer.json
index 8cdc63628f..e691593b1b 100644
--- a/vendor/league/commonmark/composer.json
+++ b/vendor/league/commonmark/composer.json
@@ -1,8 +1,8 @@
 {
     "name": "league/commonmark",
     "type": "library",
-    "description": "PHP Markdown parser based on the CommonMark spec",
-    "keywords": ["markdown","parser","commonmark"],
+    "description": "Highly-extensible PHP Markdown parser which fully supports the CommonMark spec and Github-Flavored Markdown (GFM)",
+    "keywords": ["markdown","parser","commonmark","gfm","github","flavored","github-flavored","md"],
     "homepage": "https://commonmark.thephpleague.com",
     "license": "BSD-3-Clause",
     "authors": [
@@ -19,9 +19,6 @@
         "rss": "https://github.com/thephpleague/commonmark/releases.atom",
         "source": "https://github.com/thephpleague/commonmark"
     },
-    "replace": {
-        "colinodell/commonmark-php": "*"
-    },
     "require": {
         "php": "^7.1",
         "ext-mbstring": "*"
@@ -31,6 +28,7 @@
         "cebe/markdown": "~1.0",
         "commonmark/commonmark.js": "0.29.1",
         "erusev/parsedown": "~1.0",
+        "github/gfm": "0.29.0",
         "michelf/php-markdown": "~1.4",
         "mikehaertl/php-shellcommand": "^1.4",
         "phpstan/phpstan-shim": "^0.11.5",
@@ -38,8 +36,8 @@
         "scrutinizer/ocular": "^1.5",
         "symfony/finder": "^4.2"
     },
-    "suggest": {
-        "league/commonmark-extras": "Library of useful extensions including smart punctuation"
+    "conflict": {
+        "scrutinizer/ocular": "1.7.*"
     },
     "repositories": [
         {
@@ -52,6 +50,17 @@
                     "type": "zip"
                 }
             }
+        },
+        {
+            "type": "package",
+            "package": {
+                "name": "github/gfm",
+                "version": "0.29.0",
+                "dist": {
+                    "url": "https://github.com/github/cmark-gfm/archive/0.29.0.gfm.0.zip",
+                    "type": "zip"
+                }
+            }
         }
     ],
     "autoload": {
@@ -76,7 +85,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "1.3-dev"
+            "dev-master": "1.4-dev"
         }
     },
     "config": {
diff --git a/vendor/league/commonmark/src/Block/Element/BlockQuote.php b/vendor/league/commonmark/src/Block/Element/BlockQuote.php
index 46bb257065..9973b69096 100644
--- a/vendor/league/commonmark/src/Block/Element/BlockQuote.php
+++ b/vendor/league/commonmark/src/Block/Element/BlockQuote.php
@@ -47,7 +47,7 @@ class BlockQuote extends AbstractBlock
     {
         if (!$cursor->isIndented() && $cursor->getNextNonSpaceCharacter() === '>') {
             $cursor->advanceToNextNonSpaceOrTab();
-            $cursor->advance();
+            $cursor->advanceBy(1);
             $cursor->advanceBySpaceOrTab();
 
             return true;
diff --git a/vendor/league/commonmark/src/Block/Parser/BlockQuoteParser.php b/vendor/league/commonmark/src/Block/Parser/BlockQuoteParser.php
index 7300ede8f3..ce0f0c81b7 100644
--- a/vendor/league/commonmark/src/Block/Parser/BlockQuoteParser.php
+++ b/vendor/league/commonmark/src/Block/Parser/BlockQuoteParser.php
@@ -37,7 +37,7 @@ final class BlockQuoteParser implements BlockParserInterface
         }
 
         $cursor->advanceToNextNonSpaceOrTab();
-        $cursor->advance();
+        $cursor->advanceBy(1);
         $cursor->advanceBySpaceOrTab();
 
         $context->addBlock(new BlockQuote());
diff --git a/vendor/league/commonmark/src/Block/Parser/FencedCodeParser.php b/vendor/league/commonmark/src/Block/Parser/FencedCodeParser.php
index 56ca75717b..050d62873a 100644
--- a/vendor/league/commonmark/src/Block/Parser/FencedCodeParser.php
+++ b/vendor/league/commonmark/src/Block/Parser/FencedCodeParser.php
@@ -32,6 +32,11 @@ final class FencedCodeParser implements BlockParserInterface
             return false;
         }
 
+        $c = $cursor->getCharacter();
+        if ($c !== ' ' && $c !== "\t" && $c !== '`' && $c !== '~') {
+            return false;
+        }
+
         $indent = $cursor->getIndent();
         $fence = $cursor->match('/^[ \t]*(?:`{3,}(?!.*`)|^~{3,})/');
         if ($fence === null) {
diff --git a/vendor/league/commonmark/src/Block/Parser/ListParser.php b/vendor/league/commonmark/src/Block/Parser/ListParser.php
index 0ca69ab9fa..a438195587 100644
--- a/vendor/league/commonmark/src/Block/Parser/ListParser.php
+++ b/vendor/league/commonmark/src/Block/Parser/ListParser.php
@@ -20,10 +20,26 @@ use League\CommonMark\Block\Element\ListItem;
 use League\CommonMark\Block\Element\Paragraph;
 use League\CommonMark\ContextInterface;
 use League\CommonMark\Cursor;
+use League\CommonMark\Util\ConfigurationAwareInterface;
+use League\CommonMark\Util\ConfigurationInterface;
 use League\CommonMark\Util\RegexHelper;
 
-final class ListParser implements BlockParserInterface
+final class ListParser implements BlockParserInterface, ConfigurationAwareInterface
 {
+    /** @var ConfigurationInterface|null */
+    private $config;
+
+    /** @var string|null */
+    private $listMarkerRegex;
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setConfiguration(ConfigurationInterface $configuration)
+    {
+        $this->config = $configuration;
+    }
+
     /**
      * @param ContextInterface $context
      * @param Cursor           $cursor
@@ -45,7 +61,7 @@ final class ListParser implements BlockParserInterface
         $tmpCursor->advanceToNextNonSpaceOrTab();
         $rest = $tmpCursor->getRemainder();
 
-        if (\preg_match('/^[*+-]/', $rest) === 1) {
+        if (\preg_match($this->listMarkerRegex ?? $this->generateListMarkerRegex(), $rest) === 1) {
             $data = new ListData();
             $data->markerOffset = $indent;
             $data->type = ListBlock::TYPE_UNORDERED;
@@ -121,4 +137,20 @@ final class ListParser implements BlockParserInterface
 
         return $markerLength + $spacesAfterMarker;
     }
+
+    private function generateListMarkerRegex(): string
+    {
+        // No configuration given - use the defaults
+        if ($this->config === null) {
+            return $this->listMarkerRegex = '/^[*+-]/';
+        }
+
+        $markers = $this->config->get('unordered_list_markers', ['*', '+', '-']);
+
+        if (!\is_array($markers)) {
+            throw new \RuntimeException('Invalid configuration option "unordered_list_markers": value must be an array of strings');
+        }
+
+        return $this->listMarkerRegex = '/^[' . \preg_quote(\implode('', $markers), '/') . ']/';
+    }
 }
diff --git a/vendor/league/commonmark/src/Block/Renderer/ListItemRenderer.php b/vendor/league/commonmark/src/Block/Renderer/ListItemRenderer.php
index 6f165a8af0..c9972fad5a 100644
--- a/vendor/league/commonmark/src/Block/Renderer/ListItemRenderer.php
+++ b/vendor/league/commonmark/src/Block/Renderer/ListItemRenderer.php
@@ -16,7 +16,9 @@ namespace League\CommonMark\Block\Renderer;
 
 use League\CommonMark\Block\Element\AbstractBlock;
 use League\CommonMark\Block\Element\ListItem;
+use League\CommonMark\Block\Element\Paragraph;
 use League\CommonMark\ElementRendererInterface;
+use League\CommonMark\Extension\TaskList\TaskListItemMarker;
 use League\CommonMark\HtmlElement;
 
 final class ListItemRenderer implements BlockRendererInterface
@@ -35,7 +37,7 @@ final class ListItemRenderer implements BlockRendererInterface
         }
 
         $contents = $htmlRenderer->renderBlocks($block->children(), $inTightList);
-        if (\substr($contents, 0, 1) === '<') {
+        if (\substr($contents, 0, 1) === '<' && !$this->startsTaskListItem($block)) {
             $contents = "\n" . $contents;
         }
         if (\substr($contents, -1, 1) === '>') {
@@ -48,4 +50,11 @@ final class ListItemRenderer implements BlockRendererInterface
 
         return $li;
     }
+
+    private function startsTaskListItem(ListItem $block): bool
+    {
+        $firstChild = $block->firstChild();
+
+        return $firstChild instanceof Paragraph && $firstChild->firstChild() instanceof TaskListItemMarker;
+    }
 }
diff --git a/vendor/league/commonmark/src/CommonMarkConverter.php b/vendor/league/commonmark/src/CommonMarkConverter.php
index 786ada5bce..87eb2f01b9 100644
--- a/vendor/league/commonmark/src/CommonMarkConverter.php
+++ b/vendor/league/commonmark/src/CommonMarkConverter.php
@@ -24,7 +24,7 @@ class CommonMarkConverter extends Converter
      *
      * This might be a typical `x.y.z` version, or `x.y-dev`.
      */
-    public const VERSION = '1.2.0';
+    public const VERSION = '1.3.0';
 
     /** @var EnvironmentInterface */
     protected $environment;
diff --git a/vendor/league/commonmark/src/Context.php b/vendor/league/commonmark/src/Context.php
index a5799d0220..ea10a04f85 100644
--- a/vendor/league/commonmark/src/Context.php
+++ b/vendor/league/commonmark/src/Context.php
@@ -169,7 +169,7 @@ class Context implements ContextInterface
      */
     public function addBlock(AbstractBlock $block)
     {
-        $this->getBlockCloser()->closeUnmatchedBlocks();
+        $this->blockCloser->closeUnmatchedBlocks();
         $block->setStartLine($this->lineNumber);
 
         while ($this->tip !== null && !$this->tip->canContain($block)) {
@@ -190,14 +190,14 @@ class Context implements ContextInterface
      */
     public function replaceContainerBlock(AbstractBlock $replacement)
     {
-        $this->getBlockCloser()->closeUnmatchedBlocks();
-        $this->getContainer()->replaceWith($replacement);
+        $this->blockCloser->closeUnmatchedBlocks();
+        $this->container->replaceWith($replacement);
 
-        if ($this->getTip() === $this->getContainer()) {
-            $this->setTip($replacement);
+        if ($this->tip === $this->container) {
+            $this->tip = $replacement;
         }
 
-        $this->setContainer($replacement);
+        $this->container = $replacement;
     }
 
     /**
diff --git a/vendor/league/commonmark/src/Converter.php b/vendor/league/commonmark/src/Converter.php
index 500f0b3e81..38d2abc4d0 100644
--- a/vendor/league/commonmark/src/Converter.php
+++ b/vendor/league/commonmark/src/Converter.php
@@ -50,6 +50,8 @@ class Converter implements ConverterInterface
      *
      * @param string $commonMark
      *
+     * @throws \RuntimeException
+     *
      * @return string
      *
      * @api
@@ -68,6 +70,8 @@ class Converter implements ConverterInterface
      *
      * @param string $commonMark
      *
+     * @throws \RuntimeException
+     *
      * @return string
      */
     public function __invoke(string $commonMark): string
diff --git a/vendor/league/commonmark/src/ConverterInterface.php b/vendor/league/commonmark/src/ConverterInterface.php
index 20d7edcc70..974a20807e 100644
--- a/vendor/league/commonmark/src/ConverterInterface.php
+++ b/vendor/league/commonmark/src/ConverterInterface.php
@@ -21,6 +21,8 @@ interface ConverterInterface
      *
      * @param string $commonMark
      *
+     * @throws \RuntimeException
+     *
      * @return string HTML
      *
      * @api
diff --git a/vendor/league/commonmark/src/Cursor.php b/vendor/league/commonmark/src/Cursor.php
index 19a31e6492..6e4e9a2091 100644
--- a/vendor/league/commonmark/src/Cursor.php
+++ b/vendor/league/commonmark/src/Cursor.php
@@ -61,11 +61,6 @@ class Cursor
     private $partiallyConsumedTab = false;
 
     /**
-     * @var string
-     */
-    private $encoding;
-
-    /**
      * @var bool
      */
     private $lineContainsTabs;
@@ -88,7 +83,6 @@ class Cursor
         $this->line = $line;
         $this->length = \mb_strlen($line, 'UTF-8') ?: 0;
         $this->isMultibyte = $this->length !== \strlen($line);
-        $this->encoding = $this->isMultibyte ? 'UTF-8' : 'ASCII';
         $this->lineContainsTabs = false !== \strpos($line, "\t");
     }
 
@@ -169,18 +163,20 @@ class Cursor
             $index = $this->currentPosition;
         }
 
-        if (isset($this->charCache[$index])) {
-            return $this->charCache[$index];
-        }
-
         // Index out-of-bounds, or we're at the end
         if ($index < 0 || $index >= $this->length) {
             return null;
         }
 
-        return $this->charCache[$index] = $this->isMultibyte ?
-            \mb_substr($this->line, $index, 1, $this->encoding) :
-            \substr($this->line, $index, 1);
+        if ($this->isMultibyte) {
+            if (isset($this->charCache[$index])) {
+                return $this->charCache[$index];
+            }
+
+            return $this->charCache[$index] = \mb_substr($this->line, $index, 1, 'UTF-8');
+        }
+
+        return $this->line[$index];
     }
 
     /**
@@ -233,7 +229,7 @@ class Cursor
         // Optimization to avoid tab handling logic if we have no tabs
         if (!$this->lineContainsTabs || false === \strpos(
             $nextFewChars = $this->isMultibyte ?
-                \mb_substr($this->line, $this->currentPosition, $characters, $this->encoding) :
+                \mb_substr($this->line, $this->currentPosition, $characters, 'UTF-8') :
                 \substr($this->line, $this->currentPosition, $characters),
             "\t")) {
             $length = \min($characters, $this->length - $this->currentPosition);
@@ -322,17 +318,22 @@ class Cursor
      */
     public function advanceToNextNonSpaceOrNewline(): int
     {
+        $remainder = $this->getRemainder();
+
+        // Optimization: Avoid the regex if we know there are no spaces or newlines
+        if (empty($remainder) || ($remainder[0] !== ' ' && $remainder[0] !== "\n")) {
+            $this->previousPosition = $this->currentPosition;
+
+            return 0;
+        }
+
         $matches = [];
-        \preg_match('/^ *(?:\n *)?/', $this->getRemainder(), $matches, \PREG_OFFSET_CAPTURE);
+        \preg_match('/^ *(?:\n *)?/', $remainder, $matches, \PREG_OFFSET_CAPTURE);
 
         // [0][0] contains the matched text
         // [0][1] contains the index of that match
         $increment = $matches[0][1] + \strlen($matches[0][0]);
 
-        if ($increment === 0) {
-            return 0;
-        }
-
         $this->advanceBy($increment);
 
         return $this->currentPosition - $this->previousPosition;
@@ -371,7 +372,7 @@ class Cursor
         }
 
         $subString = $this->isMultibyte ?
-            \mb_substr($this->line, $position, null, $this->encoding) :
+            \mb_substr($this->line, $position, null, 'UTF-8') :
             \substr($this->line, $position);
 
         return $prefix . $subString;
@@ -415,8 +416,8 @@ class Cursor
 
         if ($this->isMultibyte) {
             // PREG_OFFSET_CAPTURE always returns the byte offset, not the char offset, which is annoying
-            $offset = \mb_strlen(\mb_strcut($subject, 0, $matches[0][1], $this->encoding), $this->encoding);
-            $matchLength = \mb_strlen($matches[0][0], $this->encoding);
+            $offset = \mb_strlen(\substr($subject, 0, $matches[0][1]), 'UTF-8');
+            $matchLength = \mb_strlen($matches[0][0], 'UTF-8');
         } else {
             $offset = $matches[0][1];
             $matchLength = \strlen($matches[0][0]);
@@ -482,7 +483,7 @@ class Cursor
      */
     public function getPreviousText(): string
     {
-        return \mb_substr($this->line, $this->previousPosition, $this->currentPosition - $this->previousPosition, $this->encoding);
+        return \mb_substr($this->line, $this->previousPosition, $this->currentPosition - $this->previousPosition, 'UTF-8');
     }
 
     /**
@@ -494,7 +495,7 @@ class Cursor
     public function getSubstring(int $start, ?int $length = null): string
     {
         if ($this->isMultibyte) {
-            return \mb_substr($this->line, $start, $length, $this->encoding);
+            return \mb_substr($this->line, $start, $length, 'UTF-8');
         } elseif ($length !== null) {
             return \substr($this->line, $start, $length);
         }
diff --git a/vendor/league/commonmark/src/DocParser.php b/vendor/league/commonmark/src/DocParser.php
index 299256e167..dfc87d5327 100644
--- a/vendor/league/commonmark/src/DocParser.php
+++ b/vendor/league/commonmark/src/DocParser.php
@@ -20,6 +20,7 @@ use League\CommonMark\Block\Element\Document;
 use League\CommonMark\Block\Element\Paragraph;
 use League\CommonMark\Block\Element\StringContainerInterface;
 use League\CommonMark\Event\DocumentParsedEvent;
+use League\CommonMark\Exception\UnexpectedEncodingException;
 
 final class DocParser implements DocParserInterface
 {
@@ -71,6 +72,8 @@ final class DocParser implements DocParserInterface
     /**
      * @param string $input
      *
+     * @throws \RuntimeException
+     *
      * @return Document
      */
     public function parse(string $input): Document
@@ -78,6 +81,7 @@ final class DocParser implements DocParserInterface
         $document = new Document();
         $context = new Context($document, $this->environment);
 
+        $this->assertValidUTF8($input);
         $lines = $this->preProcessInput($input);
         foreach ($lines as $line) {
             $context->setNextLine($line);
@@ -243,9 +247,16 @@ final class DocParser implements DocParserInterface
         $lastLineBlank = $container->shouldLastLineBeBlank($cursor, $context->getLineNumber());
 
         // Propagate lastLineBlank up through parents:
-        while ($container instanceof AbstractBlock) {
+        while ($container instanceof AbstractBlock && $container->endsWithBlankLine() !== $lastLineBlank) {
             $container->setLastLineBlank($lastLineBlank);
             $container = $container->parent();
         }
     }
+
+    private function assertValidUTF8(string $input)
+    {
+        if (!\mb_check_encoding($input, 'UTF-8')) {
+            throw new UnexpectedEncodingException('Unexpected encoding - UTF-8 or ASCII was expected');
+        }
+    }
 }
diff --git a/vendor/league/commonmark/src/DocParserInterface.php b/vendor/league/commonmark/src/DocParserInterface.php
index f43c93093e..23725ad476 100644
--- a/vendor/league/commonmark/src/DocParserInterface.php
+++ b/vendor/league/commonmark/src/DocParserInterface.php
@@ -18,6 +18,8 @@ interface DocParserInterface
     /**
      * @param string $input
      *
+     * @throws \RuntimeException
+     *
      * @return Document
      */
     public function parse(string $input): Document;
diff --git a/vendor/league/commonmark/src/Environment.php b/vendor/league/commonmark/src/Environment.php
index 1e5e005899..eea85fdbac 100644
--- a/vendor/league/commonmark/src/Environment.php
+++ b/vendor/league/commonmark/src/Environment.php
@@ -21,6 +21,7 @@ use League\CommonMark\Delimiter\Processor\DelimiterProcessorInterface;
 use League\CommonMark\Event\AbstractEvent;
 use League\CommonMark\Extension\CommonMarkCoreExtension;
 use League\CommonMark\Extension\ExtensionInterface;
+use League\CommonMark\Extension\GithubFlavoredMarkdownExtension;
 use League\CommonMark\Inline\Parser\InlineParserInterface;
 use League\CommonMark\Inline\Renderer\InlineRendererInterface;
 use League\CommonMark\Util\Configuration;
@@ -211,7 +212,9 @@ final class Environment implements EnvironmentInterface, ConfigurableEnvironment
      */
     public function getBlockParsers(): iterable
     {
-        $this->initializeExtensions();
+        if (!$this->extensionsInitialized) {
+            $this->initializeExtensions();
+        }
 
         return $this->blockParsers->getIterator();
     }
@@ -221,7 +224,9 @@ final class Environment implements EnvironmentInterface, ConfigurableEnvironment
      */
     public function getInlineParsersForCharacter(string $character): iterable
     {
-        $this->initializeExtensions();
+        if (!$this->extensionsInitialized) {
+            $this->initializeExtensions();
+        }
 
         if (!isset($this->inlineParsersByCharacter[$character])) {
             return [];
@@ -235,7 +240,9 @@ final class Environment implements EnvironmentInterface, ConfigurableEnvironment
      */
     public function getDelimiterProcessors(): DelimiterProcessorCollection
     {
-        $this->initializeExtensions();
+        if (!$this->extensionsInitialized) {
+            $this->initializeExtensions();
+        }
 
         return $this->delimiterProcessors;
     }
@@ -245,7 +252,9 @@ final class Environment implements EnvironmentInterface, ConfigurableEnvironment
      */
     public function getBlockRenderersForClass(string $blockClass): iterable
     {
-        $this->initializeExtensions();
+        if (!$this->extensionsInitialized) {
+            $this->initializeExtensions();
+        }
 
         if (!isset($this->blockRenderersByClass[$blockClass])) {
             return [];
@@ -259,7 +268,9 @@ final class Environment implements EnvironmentInterface, ConfigurableEnvironment
      */
     public function getInlineRenderersForClass(string $inlineClass): iterable
     {
-        $this->initializeExtensions();
+        if (!$this->extensionsInitialized) {
+            $this->initializeExtensions();
+        }
 
         if (!isset($this->inlineRenderersByClass[$inlineClass])) {
             return [];
@@ -297,11 +308,6 @@ final class Environment implements EnvironmentInterface, ConfigurableEnvironment
 
     private function initializeExtensions()
     {
-        // Only initialize them once
-        if ($this->extensionsInitialized) {
-            return;
-        }
-
         // Ask all extensions to register their components
         while (!empty($this->uninitializedExtensions)) {
             foreach ($this->uninitializedExtensions as $i => $extension) {
@@ -349,6 +355,14 @@ final class Environment implements EnvironmentInterface, ConfigurableEnvironment
         return $environment;
     }
 
+    public static function createGFMEnvironment(): EnvironmentInterface
+    {
+        $environment = self::createCommonMarkEnvironment();
+        $environment->addExtension(new GithubFlavoredMarkdownExtension());
+
+        return $environment;
+    }
+
     /**
      * {@inheritdoc}
      */
@@ -378,7 +392,9 @@ final class Environment implements EnvironmentInterface, ConfigurableEnvironment
      */
     public function dispatch(AbstractEvent $event): void
     {
-        $this->initializeExtensions();
+        if (!$this->extensionsInitialized) {
+            $this->initializeExtensions();
+        }
 
         $type = \get_class($event);
 
diff --git a/vendor/league/commonmark/src/Exception/UnexpectedEncodingException.php b/vendor/league/commonmark/src/Exception/UnexpectedEncodingException.php
new file mode 100644
index 0000000000..ada054bc90
--- /dev/null
+++ b/vendor/league/commonmark/src/Exception/UnexpectedEncodingException.php
@@ -0,0 +1,16 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Exception;
+
+final class UnexpectedEncodingException extends \RuntimeException
+{
+}
diff --git a/vendor/league/commonmark/src/Extension/Autolink/AutolinkExtension.php b/vendor/league/commonmark/src/Extension/Autolink/AutolinkExtension.php
new file mode 100644
index 0000000000..76ab3dcc2e
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/Autolink/AutolinkExtension.php
@@ -0,0 +1,25 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\Autolink;
+
+use League\CommonMark\ConfigurableEnvironmentInterface;
+use League\CommonMark\Event\DocumentParsedEvent;
+use League\CommonMark\Extension\ExtensionInterface;
+
+final class AutolinkExtension implements ExtensionInterface
+{
+    public function register(ConfigurableEnvironmentInterface $environment)
+    {
+        $environment->addEventListener(DocumentParsedEvent::class, new EmailAutolinkProcessor());
+        $environment->addEventListener(DocumentParsedEvent::class, new UrlAutolinkProcessor());
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/Autolink/EmailAutolinkProcessor.php b/vendor/league/commonmark/src/Extension/Autolink/EmailAutolinkProcessor.php
new file mode 100644
index 0000000000..6916d3c2e2
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/Autolink/EmailAutolinkProcessor.php
@@ -0,0 +1,78 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\Autolink;
+
+use League\CommonMark\Event\DocumentParsedEvent;
+use League\CommonMark\Inline\Element\Link;
+use League\CommonMark\Inline\Element\Text;
+
+final class EmailAutolinkProcessor
+{
+    const REGEX = '/([A-Za-z0-9.\-_+]+@[A-Za-z0-9\-_]+\.[A-Za-z0-9\-_.]+)/';
+
+    /**
+     * @param DocumentParsedEvent $e
+     *
+     * @return void
+     */
+    public function __invoke(DocumentParsedEvent $e)
+    {
+        $walker = $e->getDocument()->walker();
+
+        while ($event = $walker->next()) {
+            $node = $event->getNode();
+            if ($node instanceof Text && !($node->parent() instanceof Link)) {
+                self::processAutolinks($node);
+            }
+        }
+    }
+
+    private static function processAutolinks(Text $node)
+    {
+        $contents = \preg_split(self::REGEX, $node->getContent(), -1, PREG_SPLIT_DELIM_CAPTURE);
+
+        if ($contents === false || \count($contents) === 1) {
+            return;
+        }
+
+        $leftovers = '';
+        foreach ($contents as $i => $content) {
+            if ($i % 2 === 0) {
+                $text = $leftovers . $content;
+                if ($text !== '') {
+                    $node->insertBefore(new Text($leftovers . $content));
+                }
+
+                $leftovers = '';
+                continue;
+            }
+
+            // Does the URL end with punctuation that should be stripped?
+            if (\substr($content, -1) === '.') {
+                // Add the punctuation later
+                $content = \substr($content, 0, -1);
+                $leftovers = '.';
+            }
+
+            // The last character cannot be - or _
+            if (\in_array(\substr($content, -1), ['-', '_'])) {
+                $node->insertBefore(new Text($content . $leftovers));
+                $leftovers = '';
+                continue;
+            }
+
+            $node->insertBefore(new Link('mailto:' . $content, $content));
+        }
+
+        $node->detach();
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/Autolink/InlineMentionParser.php b/vendor/league/commonmark/src/Extension/Autolink/InlineMentionParser.php
new file mode 100644
index 0000000000..2bbd56c545
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/Autolink/InlineMentionParser.php
@@ -0,0 +1,90 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\Autolink;
+
+use League\CommonMark\Inline\Element\Link;
+use League\CommonMark\Inline\Parser\InlineParserInterface;
+use League\CommonMark\InlineParserContext;
+
+final class InlineMentionParser implements InlineParserInterface
+{
+    /** @var string */
+    private $linkPattern;
+
+    /** @var string */
+    private $handleRegex;
+
+    /**
+     * @param string $linkPattern
+     * @param string $handleRegex
+     */
+    public function __construct($linkPattern, $handleRegex = '/^[A-Za-z0-9_]+(?!\w)/')
+    {
+        $this->linkPattern = $linkPattern;
+        $this->handleRegex = $handleRegex;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getCharacters(): array
+    {
+        return ['@'];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function parse(InlineParserContext $inlineContext): bool
+    {
+        $cursor = $inlineContext->getCursor();
+
+        // The @ symbol must not have any other characters immediately prior
+        $previousChar = $cursor->peek(-1);
+        if ($previousChar !== null && $previousChar !== ' ') {
+            // peek() doesn't modify the cursor, so no need to restore state first
+            return false;
+        }
+
+        // Save the cursor state in case we need to rewind and bail
+        $previousState = $cursor->saveState();
+
+        // Advance past the @ symbol to keep parsing simpler
+        $cursor->advance();
+
+        // Parse the handle
+        $handle = $cursor->match($this->handleRegex);
+        if (empty($handle)) {
+            // Regex failed to match; this isn't a valid Twitter handle
+            $cursor->restoreState($previousState);
+
+            return false;
+        }
+
+        $url = \sprintf($this->linkPattern, $handle);
+
+        $inlineContext->getContainer()->appendChild(new Link($url, '@' . $handle));
+
+        return true;
+    }
+
+    public static function createTwitterHandleParser()
+    {
+        return new self('https://twitter.com/%s', '/^[A-Za-z0-9_]{1,15}(?!\w)/');
+    }
+
+    public static function createGithubHandleParser()
+    {
+        // RegEx adapted from https://github.com/shinnn/github-username-regex/blob/master/index.js
+        return new self('https://www.github.com/%s', '/^[a-z\d](?:[a-z\d]|-(?=[a-z\d])){0,38}(?!\w)/');
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/Autolink/README.md b/vendor/league/commonmark/src/Extension/Autolink/README.md
new file mode 100644
index 0000000000..3dfdb62477
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/Autolink/README.md
@@ -0,0 +1,73 @@
+# URL and email autolinking extension for `league/commonmark`
+
+This extension adds [GFM-style autolinking][link-gfm-spec-autolinking] to the [`league/commonmark` Markdown parser for PHP][link-league-commonmark].  It automatically link URLs and email addresses even when the CommonMark `<...>` autolink syntax is not used.
+
+It also provides a parser to autolink `@mentions` to Twitter, Github, or any custom service you wish, though this is disabled by default.
+
+## Usage
+
+Configure your `Environment` as usual and simply add the `AutolinkExtension` provided by this package:
+
+```php
+use League\CommonMark\CommonMarkConverter;
+use League\CommonMark\Environment;
+use League\CommonMark\Extension\Autolink\AutolinkExtension;
+
+// Obtain a pre-configured Environment with all the CommonMark parsers/renderers ready-to-go
+$environment = Environment::createCommonMarkEnvironment();
+
+// Add this extension
+$environment->addExtension(new AutolinkExtension());
+
+// Instantiate the converter engine and start converting some Markdown!
+$converter = new CommonMarkConverter([], $environment);
+echo $converter->convertToHtml('I successfully installed the https://github.com/thephpleague/commonmark project with the Autolink extension!');
+```
+
+## `@mention` Autolinking
+
+This extension also provides functionality to automatically link "mentions" like `@colinodell` to Twitter, Github, or any other site of your choice!
+
+For Twitter:
+
+```php
+use League\CommonMark\Environment;
+use League\CommonMark\Extension\Autolink\InlineMentionParser;
+
+$environment = Environment::createCommonMarkEnvironment();
+$environment->addInlineParser(InlineMentionParser::createTwitterHandleParser());
+
+// TODO: Instantiate your converter and convert some Markdown
+```
+
+For GitHub:
+
+```php
+use League\CommonMark\Environment;
+use League\CommonMark\Extension\Autolink\InlineMentionParser;
+
+$environment = Environment::createCommonMarkEnvironment();
+$environment->addInlineParser(InlineMentionParser::createGithubHandleParser());
+
+// TODO: Instantiate your converter and convert some Markdown
+```
+
+Or configure your own custom one:
+
+```php
+use League\CommonMark\Environment;
+use League\CommonMark\Extension\Autolink\InlineMentionParser;
+
+$environment = Environment::createCommonMarkEnvironment();
+$environment->addInlineParser(new InlineMentionParser('https://www.example.com/users/%s/profile'));
+
+// TODO: Instantiate your converter and convert some Markdown
+```
+
+When creating your own, you can provide two parameters to the constructor:
+
+ - A URL template where `%s` is replaced with the username (required)
+ - A regular expression to parse and validate the username (optional - defaults to `'/^[A-Za-z0-9_]+(?!\w)/'`)
+
+[link-league-commonmark]: https://github.com/thephpleague/commonmark
+[link-gfm-spec-autolinking]: https://github.github.com/gfm/#autolinks-extension-
diff --git a/vendor/league/commonmark/src/Extension/Autolink/UrlAutolinkProcessor.php b/vendor/league/commonmark/src/Extension/Autolink/UrlAutolinkProcessor.php
new file mode 100644
index 0000000000..8783e4e2e7
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/Autolink/UrlAutolinkProcessor.php
@@ -0,0 +1,149 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\Autolink;
+
+use League\CommonMark\Event\DocumentParsedEvent;
+use League\CommonMark\Inline\Element\Link;
+use League\CommonMark\Inline\Element\Text;
+
+final class UrlAutolinkProcessor
+{
+    // RegEx adapted from https://github.com/symfony/symfony/blob/4.2/src/Symfony/Component/Validator/Constraints/UrlValidator.php
+    const REGEX = '~
+        (?<=^|[ \\t\\n\\x0b\\x0c\\x0d*_\\~\\(])  # Can only come at the beginning of a line, after whitespace, or certain delimiting characters
+        (
+            # Must start with a supported scheme + auth, or "www"
+            (?:
+                (?:%s)://                                 # protocol
+                (?:([\.\pL\pN-]+:)?([\.\pL\pN-]+)@)?      # basic auth
+            |www\.)
+            (?:
+                (?:[\pL\pN\pS\-\.])+(?:\.?(?:[\pL\pN]|xn\-\-[\pL\pN-]+)+\.?) # a domain name
+                    |                                                 # or
+                \d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}                    # an IP address
+                    |                                                 # or
+                \[
+                    (?:(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){6})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:::(?:(?:(?:[0-9a-f]{1,4})):){5})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){4})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,1}(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){3})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,2}(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){2})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,3}(?:(?:[0-9a-f]{1,4})))?::(?:(?:[0-9a-f]{1,4})):)(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,4}(?:(?:[0-9a-f]{1,4})))?::)(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,5}(?:(?:[0-9a-f]{1,4})))?::)(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,6}(?:(?:[0-9a-f]{1,4})))?::))))
+                \]  # an IPv6 address
+            )
+            (?::[0-9]+)?                              # a port (optional)
+            (?:/ (?:[\pL\pN\-._\~!$&\'()*+,;=:@]|%%[0-9A-Fa-f]{2})* )*      # a path
+            (?:\? (?:[\pL\pN\-._\~!$&\'()*+,;=:@/?]|%%[0-9A-Fa-f]{2})* )?   # a query (optional)
+            (?:\# (?:[\pL\pN\-._\~!$&\'()*+,;=:@/?]|%%[0-9A-Fa-f]{2})* )?   # a fragment (optional)
+        )~ixu';
+
+    private $finalRegex;
+
+    public function __construct(array $allowedProtocols = ['http', 'https', 'ftp'])
+    {
+        $this->finalRegex = \sprintf(self::REGEX, \implode('|', $allowedProtocols));
+    }
+
+    /**
+     * @param DocumentParsedEvent $e
+     *
+     * @return void
+     */
+    public function __invoke(DocumentParsedEvent $e)
+    {
+        $walker = $e->getDocument()->walker();
+
+        while ($event = $walker->next()) {
+            $node = $event->getNode();
+            if ($node instanceof Text && !($node->parent() instanceof Link)) {
+                self::processAutolinks($node, $this->finalRegex);
+            }
+        }
+    }
+
+    private static function processAutolinks(Text $node, $regex)
+    {
+        $contents = \preg_split($regex, $node->getContent(), -1, PREG_SPLIT_DELIM_CAPTURE);
+
+        if ($contents === false || \count($contents) === 1) {
+            return;
+        }
+
+        $leftovers = '';
+        foreach ($contents as $i => $content) {
+            // Even-indexed elements are things before/after the URLs
+            if ($i % 2 === 0) {
+                // Insert any left-over characters here as well
+                $text = $leftovers . $content;
+                if ($text !== '') {
+                    $node->insertBefore(new Text($leftovers . $content));
+                }
+
+                $leftovers = '';
+                continue;
+            }
+
+            $leftovers = '';
+
+            // Does the URL end with punctuation that should be stripped?
+            if (\preg_match('/(.+)([?!.,:*_~]+)$/', $content, $matches)) {
+                // Add the punctuation later
+                $content = $matches[1];
+                $leftovers = $matches[2];
+            }
+
+            // Does the URL end with something that looks like an entity reference?
+            if (\preg_match('/(.+)(&[A-Za-z0-9]+;)$/', $content, $matches)) {
+                $content = $matches[1];
+                $leftovers = $matches[2] . $leftovers;
+            }
+
+            // Does the URL need its closing paren chopped off?
+            if (\substr($content, -1) === ')' && self::hasMoreCloserParensThanOpeners($content)) {
+                $content = \substr($content, 0, -1);
+                $leftovers = ')' . $leftovers;
+            }
+
+            self::addLink($node, $content);
+        }
+
+        $node->detach();
+    }
+
+    private static function addLink(Text $node, $url)
+    {
+        // Auto-prefix 'http://' onto 'www' URLs
+        if (\substr($url, 0, 4) === 'www.') {
+            $node->insertBefore(new Link('http://' . $url, $url));
+
+            return;
+        }
+
+        $node->insertBefore(new Link($url, $url));
+    }
+
+    /**
+     * @param string $content
+     *
+     * @return bool
+     */
+    private static function hasMoreCloserParensThanOpeners($content)
+    {
+        // Scan the entire autolink for the total number of parentheses.
+        // If there is a greater number of closing parentheses than opening ones,
+        // we don’t consider the last character part of the autolink, in order to
+        // facilitate including an autolink inside a parenthesis.
+        \preg_match_all('/[()]/', $content, $matches);
+
+        $charCount = ['(' => 0, ')' => 0];
+        foreach ($matches[0] as $char) {
+            $charCount[$char]++;
+        }
+
+        return $charCount[')'] > $charCount['('];
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/DisallowedRawHtml/DisallowedRawHtmlBlockRenderer.php b/vendor/league/commonmark/src/Extension/DisallowedRawHtml/DisallowedRawHtmlBlockRenderer.php
new file mode 100644
index 0000000000..7947c5e7e5
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/DisallowedRawHtml/DisallowedRawHtmlBlockRenderer.php
@@ -0,0 +1,53 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\DisallowedRawHtml;
+
+use League\CommonMark\Block\Element\AbstractBlock;
+use League\CommonMark\Block\Renderer\BlockRendererInterface;
+use League\CommonMark\ElementRendererInterface;
+use League\CommonMark\Util\ConfigurationAwareInterface;
+use League\CommonMark\Util\ConfigurationInterface;
+
+final class DisallowedRawHtmlBlockRenderer implements BlockRendererInterface, ConfigurationAwareInterface
+{
+    private $htmlBlockRenderer;
+
+    public function __construct(BlockRendererInterface $htmlBlockRenderer)
+    {
+        $this->htmlBlockRenderer = $htmlBlockRenderer;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function render(AbstractBlock $block, ElementRendererInterface $htmlRenderer, bool $inTightList = false)
+    {
+        $rendered = $this->htmlBlockRenderer->render($block, $htmlRenderer, $inTightList);
+
+        if ($rendered === '') {
+            return '';
+        }
+
+        // Match these types of tags: <title> </title> <title x="sdf"> <title/> <title />
+        return preg_replace('/<(\/?(?:title|textarea|style|xmp|iframe|noembed|noframes|script|plaintext)[ \/>])/i', '&lt;$1', $rendered);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setConfiguration(ConfigurationInterface $configuration)
+    {
+        if ($this->htmlBlockRenderer instanceof ConfigurationAwareInterface) {
+            $this->htmlBlockRenderer->setConfiguration($configuration);
+        }
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/DisallowedRawHtml/DisallowedRawHtmlExtension.php b/vendor/league/commonmark/src/Extension/DisallowedRawHtml/DisallowedRawHtmlExtension.php
new file mode 100644
index 0000000000..f5579dba5f
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/DisallowedRawHtml/DisallowedRawHtmlExtension.php
@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\DisallowedRawHtml;
+
+use League\CommonMark\Block\Element\HtmlBlock;
+use League\CommonMark\Block\Renderer\HtmlBlockRenderer;
+use League\CommonMark\ConfigurableEnvironmentInterface;
+use League\CommonMark\Extension\ExtensionInterface;
+use League\CommonMark\Inline\Element\HtmlInline;
+use League\CommonMark\Inline\Renderer\HtmlInlineRenderer;
+
+final class DisallowedRawHtmlExtension implements ExtensionInterface
+{
+    public function register(ConfigurableEnvironmentInterface $environment)
+    {
+        $environment->addBlockRenderer(HtmlBlock::class, new DisallowedRawHtmlBlockRenderer(new HtmlBlockRenderer()), 50);
+        $environment->addInlineRenderer(HtmlInline::class, new DisallowedRawHtmlInlineRenderer(new HtmlInlineRenderer()), 50);
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/DisallowedRawHtml/DisallowedRawHtmlInlineRenderer.php b/vendor/league/commonmark/src/Extension/DisallowedRawHtml/DisallowedRawHtmlInlineRenderer.php
new file mode 100644
index 0000000000..2783281ec9
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/DisallowedRawHtml/DisallowedRawHtmlInlineRenderer.php
@@ -0,0 +1,53 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\DisallowedRawHtml;
+
+use League\CommonMark\ElementRendererInterface;
+use League\CommonMark\Inline\Element\AbstractInline;
+use League\CommonMark\Inline\Renderer\InlineRendererInterface;
+use League\CommonMark\Util\ConfigurationAwareInterface;
+use League\CommonMark\Util\ConfigurationInterface;
+
+final class DisallowedRawHtmlInlineRenderer implements InlineRendererInterface, ConfigurationAwareInterface
+{
+    private $htmlInlineRenderer;
+
+    public function __construct(InlineRendererInterface $htmlBlockRenderer)
+    {
+        $this->htmlInlineRenderer = $htmlBlockRenderer;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function render(AbstractInline $inline, ElementRendererInterface $htmlRenderer)
+    {
+        $rendered = $this->htmlInlineRenderer->render($inline, $htmlRenderer);
+
+        if ($rendered === '') {
+            return '';
+        }
+
+        // Match these types of tags: <title> </title> <title x="sdf"> <title/> <title />
+        return preg_replace('/<(\/?(?:title|textarea|style|xmp|iframe|noembed|noframes|script|plaintext)[ \/>])/i', '&lt;$1', $rendered);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setConfiguration(ConfigurationInterface $configuration)
+    {
+        if ($this->htmlInlineRenderer instanceof ConfigurationAwareInterface) {
+            $this->htmlInlineRenderer->setConfiguration($configuration);
+        }
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/ExternalLink/ExternalLinkExtension.php b/vendor/league/commonmark/src/Extension/ExternalLink/ExternalLinkExtension.php
new file mode 100644
index 0000000000..9deee0bd0e
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/ExternalLink/ExternalLinkExtension.php
@@ -0,0 +1,24 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\ExternalLink;
+
+use League\CommonMark\ConfigurableEnvironmentInterface;
+use League\CommonMark\Event\DocumentParsedEvent;
+use League\CommonMark\Extension\ExtensionInterface;
+
+final class ExternalLinkExtension implements ExtensionInterface
+{
+    public function register(ConfigurableEnvironmentInterface $environment)
+    {
+        $environment->addEventListener(DocumentParsedEvent::class, new ExternalLinkProcessor($environment));
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/ExternalLink/ExternalLinkProcessor.php b/vendor/league/commonmark/src/Extension/ExternalLink/ExternalLinkProcessor.php
new file mode 100644
index 0000000000..200f35c0f1
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/ExternalLink/ExternalLinkProcessor.php
@@ -0,0 +1,105 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\ExternalLink;
+
+use League\CommonMark\EnvironmentInterface;
+use League\CommonMark\Event\DocumentParsedEvent;
+use League\CommonMark\Inline\Element\Link;
+
+final class ExternalLinkProcessor
+{
+    /** @var EnvironmentInterface */
+    private $environment;
+
+    /**
+     * @param EnvironmentInterface $environment
+     */
+    public function __construct(EnvironmentInterface $environment)
+    {
+        $this->environment = $environment;
+    }
+
+    /**
+     * @param DocumentParsedEvent $e
+     */
+    public function __invoke(DocumentParsedEvent $e)
+    {
+        $internalHosts = $this->environment->getConfig('external_link/internal_hosts', []);
+        $openInNewWindow = $this->environment->getConfig('external_link/open_in_new_window', false);
+        $classes = $this->environment->getConfig('external_link/html_class', '');
+
+        $walker = $e->getDocument()->walker();
+        while ($event = $walker->next()) {
+            if ($event->isEntering() && $event->getNode() instanceof Link) {
+                /** @var Link $link */
+                $link = $event->getNode();
+
+                $host = parse_url($link->getUrl(), PHP_URL_HOST);
+                if (empty($host)) {
+                    // Something is terribly wrong with this URL
+                    continue;
+                }
+
+                if (self::hostMatches($host, $internalHosts)) {
+                    $link->data['external'] = false;
+                    continue;
+                }
+
+                // Host does not match our list
+                $this->markLinkAsExternal($link, $openInNewWindow, $classes);
+            }
+        }
+    }
+
+    /**
+     * @param Link   $link
+     * @param bool   $openInNewWindow
+     * @param string $classes
+     */
+    private function markLinkAsExternal(Link $link, bool $openInNewWindow, string $classes): void
+    {
+        $link->data['external'] = true;
+        $link->data['attributes'] = $link->getData('attributes', []);
+        $link->data['attributes']['rel'] = 'noopener noreferrer';
+
+        if ($openInNewWindow) {
+            $link->data['attributes']['target'] = '_blank';
+        }
+
+        if (!empty($classes)) {
+            $link->data['attributes']['class'] = trim(($link->data['attributes']['class'] ?? '') . ' ' . $classes);
+        }
+    }
+
+    /**
+     * @param string $host
+     * @param mixed  $compareTo
+     *
+     * @return bool
+     *
+     * @internal This method is only public so we can easily test it. DO NOT USE THIS OUTSIDE OF THIS EXTENSION!
+     */
+    public static function hostMatches(string $host, $compareTo)
+    {
+        foreach ((array) $compareTo as $c) {
+            if (strpos($c, '/') === 0) {
+                if (preg_match($c, $host)) {
+                    return true;
+                }
+            } elseif ($c === $host) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/ExternalLink/README.md b/vendor/league/commonmark/src/Extension/ExternalLink/README.md
new file mode 100644
index 0000000000..2eec7e22c4
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/ExternalLink/README.md
@@ -0,0 +1,100 @@
+# Extension to denote external links for `league/commonmark`
+
+This extension to the [`league/commonmark` PHP Markdown parser][link-league-commonmark] can detect links to external sites and adjust the markup accordingly:
+
+ - Adds a `rel="noopener noreferrer"` attribute
+ - Optionally adds any custom HTML classes
+
+## Usage
+
+Configure your `Environment` as usual and simply add the `ExternalLinkExtension` provided by this package:
+
+```php
+use League\CommonMark\CommonMarkConverter;
+use League\CommonMark\Environment;
+use League\CommonMark\Extension\ExternalLink\ExternalLinkExtension;
+
+// Obtain a pre-configured Environment with all the CommonMark parsers/renderers ready-to-go
+$environment = Environment::createCommonMarkEnvironment();
+
+// Add this extension
+$environment->addExtension(new ExternalLinkExtension());
+
+// Set your configuration
+$config = [
+    'external_link' => [
+        'internal_hosts' => 'www.example.com',
+        'open_in_new_window' => true,
+        'html_class' => 'external-link',
+    ],
+];
+
+// Instantiate the converter engine and start converting some Markdown!
+$converter = new CommonMarkConverter($config, $environment);
+echo $converter->convertToHtml('I successfully installed the https://github.com/thephpleague/commonmark project with the Autolink extension!');
+```
+
+## Configuration
+
+This extension supports three configuration options under the `external_link` configuration:
+
+### `internal_hosts`
+
+This option defines a whitelist of hosts which are considered non-external and should not receive the external link treatment.
+
+This can be a single host name, like `'example.com'`, which must match exactly.
+
+If you need to match subdomains, use a regular expression like `'/(^|\.)example\.com$/'`.  Note that you must use `/` characters to delimit your regex.
+
+This configuration option also accepts an array of multiple strings and/or regexes:
+
+```php
+$config = [
+    'external_link' => [
+        'internal_hosts' => ['foo.example.com', 'bar.example.com', '/(^|\.)google\.com$/],
+    ],
+];
+```
+
+By default, if this option is not provided, all links will be considered external.
+
+### `open_in_new_window`
+
+This option (which defaults to `false`) determines whether any external links should open in a new tab/window.
+
+### `html_class`
+
+This option allows you to provide a `string` containing one or more HTML classes that should be added to the external link `<a>` tags:  No classes are added by default.
+
+## Advanced Rendering
+
+When an external link is detected, the `ExternalLinkProcessor` will set the `external` data option on the `Link` node to either `true` or `false`.  You can therefore create a [custom link renderer](https://commonmark.thephpleague.com/customization/inline-rendering/) which checks this value and behaves accordingly:
+
+```php
+class MyCustomLinkRenderer implements InlineRendererInterface
+{
+
+    /**
+     * @param Link                     $inline
+     * @param ElementRendererInterface $htmlRenderer
+     *
+     * @return HtmlElement
+     */
+    public function render(AbstractInline $inline, ElementRendererInterface $htmlRenderer)
+    {
+        if (!($inline instanceof Link)) {
+            throw new \InvalidArgumentException('Incompatible inline type: ' . \get_class($inline));
+        }
+
+        if ($inline->getData('external')) {
+            // This is an external link - render it accordingly
+        } else {
+            // This is an internal link
+        }
+
+        // ...
+    }
+}
+```
+
+[link-league-commonmark]: https://github.com/thephpleague/commonmark
diff --git a/vendor/league/commonmark/src/Extension/GithubFlavoredMarkdownExtension.php b/vendor/league/commonmark/src/Extension/GithubFlavoredMarkdownExtension.php
new file mode 100644
index 0000000000..41659c126b
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/GithubFlavoredMarkdownExtension.php
@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension;
+
+use League\CommonMark\ConfigurableEnvironmentInterface;
+use League\CommonMark\Extension\Autolink\AutolinkExtension;
+use League\CommonMark\Extension\DisallowedRawHtml\DisallowedRawHtmlExtension;
+use League\CommonMark\Extension\Strikethrough\StrikethroughExtension;
+use League\CommonMark\Extension\Table\TableExtension;
+use League\CommonMark\Extension\TaskList\TaskListExtension;
+
+final class GithubFlavoredMarkdownExtension implements ExtensionInterface
+{
+    public function register(ConfigurableEnvironmentInterface $environment)
+    {
+        $environment->addExtension(new AutolinkExtension());
+        $environment->addExtension(new DisallowedRawHtmlExtension());
+        $environment->addExtension(new StrikethroughExtension());
+        $environment->addExtension(new TableExtension());
+        $environment->addExtension(new TaskListExtension());
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/InlinesOnly/ChildRenderer.php b/vendor/league/commonmark/src/Extension/InlinesOnly/ChildRenderer.php
new file mode 100644
index 0000000000..defd4ceed9
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/InlinesOnly/ChildRenderer.php
@@ -0,0 +1,49 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\InlinesOnly;
+
+use League\CommonMark\Block\Element\AbstractBlock;
+use League\CommonMark\Block\Element\Document;
+use League\CommonMark\Block\Element\InlineContainerInterface;
+use League\CommonMark\Block\Renderer\BlockRendererInterface;
+use League\CommonMark\ElementRendererInterface;
+use League\CommonMark\Inline\Element\AbstractInline;
+
+/**
+ * Simply renders child elements as-is, adding newlines as needed.
+ */
+final class ChildRenderer implements BlockRendererInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function render(AbstractBlock $block, ElementRendererInterface $htmlRenderer, bool $inTightList = false)
+    {
+        $out = '';
+
+        if ($block instanceof InlineContainerInterface) {
+            /** @var iterable<AbstractInline> $children */
+            $children = $block->children();
+            $out .= $htmlRenderer->renderInlines($children);
+        } else {
+            /** @var iterable<AbstractBlock> $children */
+            $children = $block->children();
+            $out .= $htmlRenderer->renderBlocks($children);
+        }
+
+        if (!($block instanceof Document)) {
+            $out .= "\n";
+        }
+
+        return $out;
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/InlinesOnly/InlinesOnlyExtension.php b/vendor/league/commonmark/src/Extension/InlinesOnly/InlinesOnlyExtension.php
new file mode 100644
index 0000000000..29ffb303a5
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/InlinesOnly/InlinesOnlyExtension.php
@@ -0,0 +1,63 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\InlinesOnly;
+
+use League\CommonMark\Block\Element\Document;
+use League\CommonMark\Block\Element\Paragraph;
+use League\CommonMark\Block\Parser as BlockParser;
+use League\CommonMark\ConfigurableEnvironmentInterface;
+use League\CommonMark\Delimiter\Processor\EmphasisDelimiterProcessor;
+use League\CommonMark\Extension\ExtensionInterface;
+use League\CommonMark\Inline\Element as InlineElement;
+use League\CommonMark\Inline\Parser as InlineParser;
+use League\CommonMark\Inline\Renderer as InlineRenderer;
+
+final class InlinesOnlyExtension implements ExtensionInterface
+{
+    public function register(ConfigurableEnvironmentInterface $environment)
+    {
+        $childRenderer = new ChildRenderer();
+
+        $environment
+            ->addBlockParser(new BlockParser\LazyParagraphParser(), -200)
+
+            ->addInlineParser(new InlineParser\NewlineParser(),     200)
+            ->addInlineParser(new InlineParser\BacktickParser(),    150)
+            ->addInlineParser(new InlineParser\EscapableParser(),    80)
+            ->addInlineParser(new InlineParser\EntityParser(),       70)
+            ->addInlineParser(new InlineParser\AutolinkParser(),     50)
+            ->addInlineParser(new InlineParser\HtmlInlineParser(),   40)
+            ->addInlineParser(new InlineParser\CloseBracketParser(), 30)
+            ->addInlineParser(new InlineParser\OpenBracketParser(),  20)
+            ->addInlineParser(new InlineParser\BangParser(),         10)
+
+            ->addBlockRenderer(Document::class, $childRenderer, 0)
+            ->addBlockRenderer(Paragraph::class, $childRenderer, 0)
+
+            ->addInlineRenderer(InlineElement\Code::class,       new InlineRenderer\CodeRenderer(),       0)
+            ->addInlineRenderer(InlineElement\Emphasis::class,   new InlineRenderer\EmphasisRenderer(),   0)
+            ->addInlineRenderer(InlineElement\HtmlInline::class, new InlineRenderer\HtmlInlineRenderer(), 0)
+            ->addInlineRenderer(InlineElement\Image::class,      new InlineRenderer\ImageRenderer(),      0)
+            ->addInlineRenderer(InlineElement\Link::class,       new InlineRenderer\LinkRenderer(),       0)
+            ->addInlineRenderer(InlineElement\Newline::class,    new InlineRenderer\NewlineRenderer(),    0)
+            ->addInlineRenderer(InlineElement\Strong::class,     new InlineRenderer\StrongRenderer(),     0)
+            ->addInlineRenderer(InlineElement\Text::class,       new InlineRenderer\TextRenderer(),       0)
+        ;
+
+        if ($environment->getConfig('use_asterisk', true)) {
+            $environment->addDelimiterProcessor(new EmphasisDelimiterProcessor('*'));
+        }
+        if ($environment->getConfig('use_underscore', true)) {
+            $environment->addDelimiterProcessor(new EmphasisDelimiterProcessor('_'));
+        }
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/InlinesOnly/README.md b/vendor/league/commonmark/src/Extension/InlinesOnly/README.md
new file mode 100644
index 0000000000..c8eb410c0c
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/InlinesOnly/README.md
@@ -0,0 +1,25 @@
+# Inline-only extension for `league/commonmark`
+
+This extension configures the [`league/commonmark` Markdown parser for PHP](https://github.com/thephpleague/commonmark) to only render inline elements - no paragraph tags, headers, code blocks, etc.
+
+## Usage
+
+Although you normally add extra extensions to the default core one, we're not going to do that here, because this is essentially a slimmed-down version of the core extension:
+
+```php
+use League\CommonMark\CommonMarkConverter;
+use League\CommonMark\Environment;
+use League\CommonMark\Extension\InlinesOnly\InlinesOnlyExtension;
+
+// Create a new, empty environment
+$environment = new Environment();
+
+// Add this extension
+$environment->addExtension(new InlinesOnlyExtension());
+
+// Instantiate the converter engine and start converting some Markdown!
+$converter = new CommonMarkConverter($config, $environment);
+echo $converter->convertToHtml('**Hello World!**');
+```
+
+[link-league-commonmark]: https://github.com/thephpleague/commonmark
diff --git a/vendor/league/commonmark/src/Extension/SmartPunct/PunctuationParser.php b/vendor/league/commonmark/src/Extension/SmartPunct/PunctuationParser.php
new file mode 100644
index 0000000000..4247333035
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/SmartPunct/PunctuationParser.php
@@ -0,0 +1,75 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * Original code based on the CommonMark JS reference parser (http://bitly.com/commonmark-js)
+ *  - (c) John MacFarlane
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\SmartPunct;
+
+use League\CommonMark\Inline\Element\Text;
+use League\CommonMark\Inline\Parser\InlineParserInterface;
+use League\CommonMark\InlineParserContext;
+
+final class PunctuationParser implements InlineParserInterface
+{
+    /**
+     * @return string[]
+     */
+    public function getCharacters(): array
+    {
+        return ['-', '.'];
+    }
+
+    /**
+     * @param InlineParserContext $inlineContext
+     *
+     * @return bool
+     */
+    public function parse(InlineParserContext $inlineContext): bool
+    {
+        $cursor = $inlineContext->getCursor();
+        $ch = $cursor->getCharacter();
+
+        // Ellipses
+        if ($ch === '.' && $matched = $cursor->match('/^\\.( ?\\.)\\1/')) {
+            $inlineContext->getContainer()->appendChild(new Text('…'));
+
+            return true;
+        }
+
+        // Em/En-dashes
+        elseif ($ch === '-' && $matched = $cursor->match('/^(?<!-)(-{2,})/')) {
+            $count = strlen($matched);
+            $en_dash = '–';
+            $en_count = 0;
+            $em_dash = '—';
+            $em_count = 0;
+            if ($count % 3 === 0) { // If divisible by 3, use all em dashes
+                $em_count = $count / 3;
+            } elseif ($count % 2 === 0) { // If divisible by 2, use all en dashes
+                $en_count = $count / 2;
+            } elseif ($count % 3 === 2) { // If 2 extra dashes, use en dash for last 2; em dashes for rest
+                $em_count = ($count - 2) / 3;
+                $en_count = 1;
+            } else { // Use en dashes for last 4 hyphens; em dashes for rest
+                $em_count = ($count - 4) / 3;
+                $en_count = 2;
+            }
+            $inlineContext->getContainer()->appendChild(new Text(
+                str_repeat($em_dash, $em_count) . str_repeat($en_dash, $en_count)
+            ));
+
+            return true;
+        }
+
+        return false;
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/SmartPunct/Quote.php b/vendor/league/commonmark/src/Extension/SmartPunct/Quote.php
new file mode 100644
index 0000000000..cf3c15b406
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/SmartPunct/Quote.php
@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * Original code based on the CommonMark JS reference parser (http://bitly.com/commonmark-js)
+ *  - (c) John MacFarlane
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\SmartPunct;
+
+use League\CommonMark\Inline\Element\AbstractStringContainer;
+
+final class Quote extends AbstractStringContainer
+{
+    public const DOUBLE_QUOTE = '"';
+    public const DOUBLE_QUOTE_OPENER = '“';
+    public const DOUBLE_QUOTE_CLOSER = '”';
+
+    public const SINGLE_QUOTE = "'";
+    public const SINGLE_QUOTE_OPENER = '‘';
+    public const SINGLE_QUOTE_CLOSER = '’';
+}
diff --git a/vendor/league/commonmark/src/Extension/SmartPunct/QuoteParser.php b/vendor/league/commonmark/src/Extension/SmartPunct/QuoteParser.php
new file mode 100644
index 0000000000..bc3ea0cd24
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/SmartPunct/QuoteParser.php
@@ -0,0 +1,113 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * Original code based on the CommonMark JS reference parser (http://bitly.com/commonmark-js)
+ *  - (c) John MacFarlane
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\SmartPunct;
+
+use League\CommonMark\Delimiter\Delimiter;
+use League\CommonMark\Inline\Parser\InlineParserInterface;
+use League\CommonMark\InlineParserContext;
+use League\CommonMark\Util\RegexHelper;
+
+final class QuoteParser implements InlineParserInterface
+{
+    public const DOUBLE_QUOTES = [Quote::DOUBLE_QUOTE, Quote::DOUBLE_QUOTE_OPENER, Quote::DOUBLE_QUOTE_CLOSER];
+    public const SINGLE_QUOTES = [Quote::SINGLE_QUOTE, Quote::SINGLE_QUOTE_OPENER, Quote::SINGLE_QUOTE_CLOSER];
+
+    /**
+     * @return string[]
+     */
+    public function getCharacters(): array
+    {
+        return array_merge(self::DOUBLE_QUOTES, self::SINGLE_QUOTES);
+    }
+
+    /**
+     * Normalizes any quote characters found and manually adds them to the delimiter stack
+     *
+     * @param InlineParserContext $inlineContext
+     *
+     * @return bool
+     */
+    public function parse(InlineParserContext $inlineContext): bool
+    {
+        $cursor = $inlineContext->getCursor();
+        $normalizedCharacter = $this->getNormalizedQuoteCharacter($cursor->getCharacter());
+
+        $charBefore = $cursor->peek(-1);
+        if ($charBefore === null) {
+            $charBefore = "\n";
+        }
+
+        $cursor->advance();
+
+        $charAfter = $cursor->getCharacter();
+        if ($charAfter === null) {
+            $charAfter = "\n";
+        }
+
+        [$leftFlanking, $rightFlanking] = $this->determineFlanking($charBefore, $charAfter);
+        $canOpen = $leftFlanking && !$rightFlanking;
+        $canClose = $rightFlanking;
+
+        $node = new Quote($normalizedCharacter, ['delim' => true]);
+        $inlineContext->getContainer()->appendChild($node);
+
+        // Add entry to stack to this opener
+        $inlineContext->getDelimiterStack()->push(new Delimiter($normalizedCharacter, 1, $node, $canOpen, $canClose));
+
+        return true;
+    }
+
+    /**
+     * @param string $character
+     *
+     * @return string|null
+     */
+    private function getNormalizedQuoteCharacter($character)
+    {
+        if (in_array($character, self::DOUBLE_QUOTES)) {
+            return Quote::DOUBLE_QUOTE;
+        } elseif (in_array($character, self::SINGLE_QUOTES)) {
+            return Quote::SINGLE_QUOTE;
+        }
+
+        return $character;
+    }
+
+    /**
+     * @param string $charBefore
+     * @param string $charAfter
+     *
+     * @return bool[]
+     */
+    private function determineFlanking($charBefore, $charAfter)
+    {
+        $afterIsWhitespace = preg_match('/\pZ|\s/u', $charAfter);
+        $afterIsPunctuation = preg_match(RegexHelper::REGEX_PUNCTUATION, $charAfter);
+        $beforeIsWhitespace = preg_match('/\pZ|\s/u', $charBefore);
+        $beforeIsPunctuation = preg_match(RegexHelper::REGEX_PUNCTUATION, $charBefore);
+
+        $leftFlanking = !$afterIsWhitespace &&
+            !($afterIsPunctuation &&
+                !$beforeIsWhitespace &&
+                !$beforeIsPunctuation);
+
+        $rightFlanking = !$beforeIsWhitespace &&
+            !($beforeIsPunctuation &&
+                !$afterIsWhitespace &&
+                !$afterIsPunctuation);
+
+        return [$leftFlanking, $rightFlanking];
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/SmartPunct/QuoteProcessor.php b/vendor/league/commonmark/src/Extension/SmartPunct/QuoteProcessor.php
new file mode 100644
index 0000000000..e8d4bc71de
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/SmartPunct/QuoteProcessor.php
@@ -0,0 +1,112 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * Original code based on the CommonMark JS reference parser (http://bitly.com/commonmark-js)
+ *  - (c) John MacFarlane
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\SmartPunct;
+
+use League\CommonMark\Delimiter\DelimiterInterface;
+use League\CommonMark\Delimiter\Processor\DelimiterProcessorInterface;
+use League\CommonMark\Inline\Element\AbstractStringContainer;
+
+final class QuoteProcessor implements DelimiterProcessorInterface
+{
+    /** @var string */
+    private $normalizedCharacter;
+
+    /** @var string */
+    private $openerCharacter;
+
+    /** @var string */
+    private $closerCharacter;
+
+    /**
+     * QuoteProcessor constructor.
+     *
+     * @param string $char
+     * @param string $opener
+     * @param string $closer
+     */
+    private function __construct(string $char, string $opener, string $closer)
+    {
+        $this->normalizedCharacter = $char;
+        $this->openerCharacter = $opener;
+        $this->closerCharacter = $closer;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getOpeningCharacter(): string
+    {
+        return $this->normalizedCharacter;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getClosingCharacter(): string
+    {
+        return $this->normalizedCharacter;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getMinLength(): int
+    {
+        return 1;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getDelimiterUse(DelimiterInterface $opener, DelimiterInterface $closer): int
+    {
+        return 1;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function process(AbstractStringContainer $opener, AbstractStringContainer $closer, int $delimiterUse)
+    {
+        $opener->insertAfter(new Quote($this->openerCharacter));
+        $closer->insertBefore(new Quote($this->closerCharacter));
+    }
+
+    /**
+     * Create a double-quote processor
+     *
+     * @param string $opener
+     * @param string $closer
+     *
+     * @return QuoteProcessor
+     */
+    public static function createDoubleQuoteProcessor(string $opener = Quote::DOUBLE_QUOTE_OPENER, string $closer = Quote::DOUBLE_QUOTE_CLOSER): self
+    {
+        return new self(Quote::DOUBLE_QUOTE, $opener, $closer);
+    }
+
+    /**
+     * Create a single-quote processor
+     *
+     * @param string $opener
+     * @param string $closer
+     *
+     * @return QuoteProcessor
+     */
+    public static function createSingleQuoteProcessor(string $opener = Quote::SINGLE_QUOTE_OPENER, string $closer = Quote::SINGLE_QUOTE_CLOSER): self
+    {
+        return new self(Quote::SINGLE_QUOTE, $opener, $closer);
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/SmartPunct/QuoteRenderer.php b/vendor/league/commonmark/src/Extension/SmartPunct/QuoteRenderer.php
new file mode 100644
index 0000000000..8cc18974b3
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/SmartPunct/QuoteRenderer.php
@@ -0,0 +1,47 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * Original code based on the CommonMark JS reference parser (http://bitly.com/commonmark-js)
+ *  - (c) John MacFarlane
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\SmartPunct;
+
+use League\CommonMark\ElementRendererInterface;
+use League\CommonMark\HtmlElement;
+use League\CommonMark\Inline\Element\AbstractInline;
+use League\CommonMark\Inline\Renderer\InlineRendererInterface;
+
+final class QuoteRenderer implements InlineRendererInterface
+{
+    /**
+     * @param AbstractInline           $inline
+     * @param ElementRendererInterface $htmlRenderer
+     *
+     * @return HtmlElement|string|null
+     */
+    public function render(AbstractInline $inline, ElementRendererInterface $htmlRenderer)
+    {
+        if (!$inline instanceof Quote) {
+            throw new \InvalidArgumentException(sprintf('Expected an instance of "%s", got "%s" instead', Quote::class, get_class($inline)));
+        }
+
+        // Handles unpaired quotes which remain after processing delimiters
+        if ($inline->getContent() === Quote::SINGLE_QUOTE) {
+            // Render as an apostrophe
+            return Quote::SINGLE_QUOTE_CLOSER;
+        } elseif ($inline->getContent() === Quote::DOUBLE_QUOTE) {
+            // Render as an opening quote
+            return Quote::DOUBLE_QUOTE_OPENER;
+        }
+
+        return $inline->getContent();
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/SmartPunct/README.md b/vendor/league/commonmark/src/Extension/SmartPunct/README.md
new file mode 100644
index 0000000000..0cc1b3dc9f
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/SmartPunct/README.md
@@ -0,0 +1,47 @@
+# Smart Punctuation for `league/commonmark`
+
+Intelligently converts ASCII quotes, dashes, and ellipses to their Unicode equivalents.  For use with the [`league/commonmark` Markdown parser for PHP](https://github.com/thephpleague/commonmark).
+
+For example, this Markdown...
+
+```md
+"CommonMark is the PHP League's Markdown parser," she said.  "It's super-configurable... you can even use additional extensions to expand its capabilities -- just like this one!"
+```
+
+Will result in this HTML:
+
+```html
+<p>“CommonMark is the PHP League’s Markdown parser,” she said.  “It’s super-configurable… you can even use additional extensions to expand its capabilities – just like this one!”</p>
+```
+
+## Usage
+
+Extensions can be added to any new `Environment`:
+
+``` php
+use League\CommonMark\CommonMarkConverter;
+use League\CommonMark\Environment;
+use League\CommonMark\Extension\SmartPunct\SmartPunctExtension;
+
+// Obtain a pre-configured Environment with all the CommonMark parsers/renderers ready-to-go
+$environment = Environment::createCommonMarkEnvironment();
+
+// Add this extension
+$environment->addExtension(new SmartPunctExtension());
+
+// Set your configuration
+$config = [
+    'smartpunct' => [
+        'double_quote_opener' => '“',
+        'double_quote_closer' => '”',
+        'single_quote_opener' => '‘',
+        'single_quote_closer' => '’',
+    ],
+];
+
+// Instantiate the converter engine and start converting some Markdown!
+$converter = new CommonMarkConverter($config, $environment);
+echo $converter->convertToHtml('# Hello World!');
+```
+
+[link-league-commonmark]: https://github.com/thephpleague/commonmark
diff --git a/vendor/league/commonmark/src/Extension/SmartPunct/SmartPunctExtension.php b/vendor/league/commonmark/src/Extension/SmartPunct/SmartPunctExtension.php
new file mode 100644
index 0000000000..f3a19d8e74
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/SmartPunct/SmartPunctExtension.php
@@ -0,0 +1,49 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * Original code based on the CommonMark JS reference parser (http://bitly.com/commonmark-js)
+ *  - (c) John MacFarlane
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\SmartPunct;
+
+use League\CommonMark\Block\Element\Document;
+use League\CommonMark\Block\Element\Paragraph;
+use League\CommonMark\Block\Renderer as CoreBlockRenderer;
+use League\CommonMark\ConfigurableEnvironmentInterface;
+use League\CommonMark\Extension\ExtensionInterface;
+use League\CommonMark\Inline\Element\Text;
+use League\CommonMark\Inline\Renderer as CoreInlineRenderer;
+
+final class SmartPunctExtension implements ExtensionInterface
+{
+    public function register(ConfigurableEnvironmentInterface $environment)
+    {
+        $environment
+            ->addInlineParser(new QuoteParser(), 10)
+            ->addInlineParser(new PunctuationParser(), 0)
+
+            ->addDelimiterProcessor(QuoteProcessor::createDoubleQuoteProcessor(
+                $environment->getConfig('smartpunct/double_quote_opener', Quote::DOUBLE_QUOTE_OPENER),
+                $environment->getConfig('smartpunct/double_quote_closer', Quote::DOUBLE_QUOTE_CLOSER)
+            ))
+            ->addDelimiterProcessor(QuoteProcessor::createSingleQuoteProcessor(
+                $environment->getConfig('smartpunct/single_quote_opener', Quote::SINGLE_QUOTE_OPENER),
+                $environment->getConfig('smartpunct/single_quote_closer', Quote::SINGLE_QUOTE_CLOSER)
+            ))
+
+            ->addBlockRenderer(Document::class, new CoreBlockRenderer\DocumentRenderer(), 0)
+            ->addBlockRenderer(Paragraph::class, new CoreBlockRenderer\ParagraphRenderer(), 0)
+
+            ->addInlineRenderer(Quote::class, new QuoteRenderer(), 100)
+            ->addInlineRenderer(Text::class, new CoreInlineRenderer\TextRenderer(), 0)
+        ;
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/Strikethrough/README.md b/vendor/league/commonmark/src/Extension/Strikethrough/README.md
new file mode 100644
index 0000000000..c93f622161
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/Strikethrough/README.md
@@ -0,0 +1,27 @@
+# Strikethrough support for `league/commonmark`
+
+This extension adds strikethrough Markdown support for the [league/commonmark](link-league-commonmark) PHP Markdown parsing engine, which itself is based on the CommonMark spec.
+
+It allows users to use `~~` in order to indicate text that should be rendered within `<del>` tags.
+
+## Usage
+
+Extensions can be added to any new `Environment`:
+
+```php
+use League\CommonMark\CommonMarkConverter;
+use League\CommonMark\Environment;
+use League\CommonMark\Extension\Strikethrough\StrikethroughExtension;
+
+// Obtain a pre-configured Environment with all the CommonMark parsers/renderers ready-to-go
+$environment = Environment::createCommonMarkEnvironment();
+
+// Add this extension
+$environment->addExtension(new StrikethroughExtension());
+
+// Instantiate the converter engine and start converting some Markdown!
+$converter = new CommonMarkConverter($config, $environment);
+echo $converter->convertToHtml('This extension is ~~good~~ great!');
+```
+
+[link-league-commonmark]: https://github.com/thephpleague/commonmark
diff --git a/vendor/league/commonmark/src/Extension/Strikethrough/Strikethrough.php b/vendor/league/commonmark/src/Extension/Strikethrough/Strikethrough.php
new file mode 100644
index 0000000000..09c8f20eb7
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/Strikethrough/Strikethrough.php
@@ -0,0 +1,25 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com> and uAfrica.com (http://uafrica.com)
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\Strikethrough;
+
+use League\CommonMark\Inline\Element\AbstractInline;
+
+final class Strikethrough extends AbstractInline
+{
+    /**
+     * @return bool
+     */
+    public function isContainer(): bool
+    {
+        return true;
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/Strikethrough/StrikethroughDelimiterProcessor.php b/vendor/league/commonmark/src/Extension/Strikethrough/StrikethroughDelimiterProcessor.php
new file mode 100644
index 0000000000..25983435c8
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/Strikethrough/StrikethroughDelimiterProcessor.php
@@ -0,0 +1,70 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com> and uAfrica.com (http://uafrica.com)
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\Strikethrough;
+
+use League\CommonMark\Delimiter\DelimiterInterface;
+use League\CommonMark\Delimiter\Processor\DelimiterProcessorInterface;
+use League\CommonMark\Inline\Element\AbstractStringContainer;
+
+final class StrikethroughDelimiterProcessor implements DelimiterProcessorInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function getOpeningCharacter(): string
+    {
+        return '~';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getClosingCharacter(): string
+    {
+        return '~';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getMinLength(): int
+    {
+        return 2;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getDelimiterUse(DelimiterInterface $opener, DelimiterInterface $closer): int
+    {
+        $min = \min($opener->getLength(), $closer->getLength());
+
+        return $min >= 2 ? $min : 0;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function process(AbstractStringContainer $opener, AbstractStringContainer $closer, int $delimiterUse)
+    {
+        $strikethrough = new Strikethrough();
+
+        $tmp = $opener->next();
+        while ($tmp !== null && $tmp !== $closer) {
+            $next = $tmp->next();
+            $strikethrough->appendChild($tmp);
+            $tmp = $next;
+        }
+
+        $opener->insertAfter($strikethrough);
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/Strikethrough/StrikethroughExtension.php b/vendor/league/commonmark/src/Extension/Strikethrough/StrikethroughExtension.php
new file mode 100644
index 0000000000..a77d80c2a0
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/Strikethrough/StrikethroughExtension.php
@@ -0,0 +1,24 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com> and uAfrica.com (http://uafrica.com)
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\Strikethrough;
+
+use League\CommonMark\ConfigurableEnvironmentInterface;
+use League\CommonMark\Extension\ExtensionInterface;
+
+final class StrikethroughExtension implements ExtensionInterface
+{
+    public function register(ConfigurableEnvironmentInterface $environment)
+    {
+        $environment->addDelimiterProcessor(new StrikethroughDelimiterProcessor());
+        $environment->addInlineRenderer(Strikethrough::class, new StrikethroughRenderer());
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/Strikethrough/StrikethroughRenderer.php b/vendor/league/commonmark/src/Extension/Strikethrough/StrikethroughRenderer.php
new file mode 100644
index 0000000000..8b747de5ba
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/Strikethrough/StrikethroughRenderer.php
@@ -0,0 +1,32 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com> and uAfrica.com (http://uafrica.com)
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\Strikethrough;
+
+use League\CommonMark\ElementRendererInterface;
+use League\CommonMark\HtmlElement;
+use League\CommonMark\Inline\Element\AbstractInline;
+use League\CommonMark\Inline\Renderer\InlineRendererInterface;
+
+final class StrikethroughRenderer implements InlineRendererInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function render(AbstractInline $inline, ElementRendererInterface $htmlRenderer)
+    {
+        if (!($inline instanceof Strikethrough)) {
+            throw new \InvalidArgumentException('Incompatible inline type: ' . get_class($inline));
+        }
+
+        return new HtmlElement('del', $inline->getData('attributes', []), $htmlRenderer->renderInlines($inline->children()));
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/Table/README.md b/vendor/league/commonmark/src/Extension/Table/README.md
new file mode 100644
index 0000000000..ff8de545d4
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/Table/README.md
@@ -0,0 +1,78 @@
+CommonMark Table Extension
+==========================
+
+The Table extension adds the ability to create tables in CommonMark documents.
+
+Usage
+-----
+
+Configure your `Environment` as usual and simply add the `TableExtension` provided by this package:
+
+```php
+use League\CommonMark\Converter;
+use League\CommonMark\DocParser;
+use League\CommonMark\Environment;
+use League\CommonMark\HtmlRenderer;
+use League\CommonMark\Extension\Table\TableExtension;
+
+// Obtain a pre-configured Environment with all the standard CommonMark parsers/renderers ready-to-go
+$environment = Environment::createCommonMarkEnvironment();
+
+// Add this extension
+$environment->addExtension(new TableExtension());
+
+// Instantiate the converter engine and start converting some Markdown!
+$converter = new Converter(new DocParser($environment), new HtmlRenderer($environment));
+
+echo $converter->convertToHtml('# Hello World!');
+```
+
+Syntax
+------
+
+This package is fully compatible with GFM-style tables:
+
+### Simple
+
+Code:
+```markdown
+th | th(center) | th(right)
+---|:----------:|----------:
+td | td         | td
+```
+
+Result:
+```html
+<table>
+<thead>
+<tr>
+<th style="text-align: left">th</th>
+<th style="text-align: center">th(center)</th>
+<th style="text-align: right">th(right<)/th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td style="text-align: left">td</td>
+<td style="text-align: center">td</td>
+<td style="text-align: right">td</td>
+</tr>
+</tbody>
+</table>
+```
+
+### Advanced
+
+```markdown
+| header 1 | header 2 | header 2 |
+| :------- | :------: | -------: |
+| cell 1.1 | cell 1.2 | cell 1.3 |
+| cell 2.1 | cell 2.2 | cell 2.3 |
+```
+
+Credits
+-------
+
+- [Martin Hasoň](https://github.com/hason)
+- [Webuni s.r.o.](https://www.webuni.cz)
+- [Colin O'Dell](https://github.com/colinodell)
diff --git a/vendor/league/commonmark-ext-table/src/Table.php b/vendor/league/commonmark/src/Extension/Table/Table.php
index 22aa812ee8..7d1406d907 100644
--- a/vendor/league/commonmark-ext-table/src/Table.php
+++ b/vendor/league/commonmark/src/Extension/Table/Table.php
@@ -3,7 +3,7 @@
 declare(strict_types=1);
 
 /*
- * This is part of the league/commonmark-ext-table package.
+ * This is part of the league/commonmark package.
  *
  * (c) Martin Hasoň <martin.hason@gmail.com>
  * (c) Webuni s.r.o. <info@webuni.cz>
@@ -13,7 +13,7 @@ declare(strict_types=1);
  * file that was distributed with this source code.
  */
 
-namespace League\CommonMark\Ext\Table;
+namespace League\CommonMark\Extension\Table;
 
 use League\CommonMark\Block\Element\AbstractBlock;
 use League\CommonMark\Block\Element\AbstractStringContainerBlock;
@@ -21,9 +21,8 @@ use League\CommonMark\Block\Element\InlineContainerInterface;
 use League\CommonMark\ContextInterface;
 use League\CommonMark\Cursor;
 
-class Table extends AbstractStringContainerBlock implements InlineContainerInterface
+final class Table extends AbstractStringContainerBlock implements InlineContainerInterface
 {
-    private $caption;
     private $head;
     private $body;
     private $parser;
@@ -38,7 +37,7 @@ class Table extends AbstractStringContainerBlock implements InlineContainerInter
 
     public function canContain(AbstractBlock $block): bool
     {
-        return $block instanceof TableSection || $block instanceof TableCaption;
+        return $block instanceof TableSection;
     }
 
     public function isCode(): bool
@@ -46,24 +45,6 @@ class Table extends AbstractStringContainerBlock implements InlineContainerInter
         return false;
     }
 
-    public function setCaption(TableCaption $caption = null): void
-    {
-        $node = $this->getCaption();
-        if ($node instanceof TableCaption) {
-            $node->detach();
-        }
-
-        $this->caption = $caption;
-        if (null !== $caption) {
-            $this->prependChild($caption);
-        }
-    }
-
-    public function getCaption(): ?TableCaption
-    {
-        return $this->caption;
-    }
-
     public function getHead(): TableSection
     {
         return $this->head;
diff --git a/vendor/league/commonmark-ext-table/src/TableCell.php b/vendor/league/commonmark/src/Extension/Table/TableCell.php
index c8b326a03b..e71b003924 100644
--- a/vendor/league/commonmark-ext-table/src/TableCell.php
+++ b/vendor/league/commonmark/src/Extension/Table/TableCell.php
@@ -3,7 +3,7 @@
 declare(strict_types=1);
 
 /*
- * This is part of the league/commonmark-ext-table package.
+ * This is part of the league/commonmark package.
  *
  * (c) Martin Hasoň <martin.hason@gmail.com>
  * (c) Webuni s.r.o. <info@webuni.cz>
@@ -13,7 +13,7 @@ declare(strict_types=1);
  * file that was distributed with this source code.
  */
 
-namespace League\CommonMark\Ext\Table;
+namespace League\CommonMark\Extension\Table;
 
 use League\CommonMark\Block\Element\AbstractBlock;
 use League\CommonMark\Block\Element\AbstractStringContainerBlock;
@@ -21,7 +21,7 @@ use League\CommonMark\Block\Element\InlineContainerInterface;
 use League\CommonMark\ContextInterface;
 use League\CommonMark\Cursor;
 
-class TableCell extends AbstractStringContainerBlock implements InlineContainerInterface
+final class TableCell extends AbstractStringContainerBlock implements InlineContainerInterface
 {
     const TYPE_HEAD = 'th';
     const TYPE_BODY = 'td';
diff --git a/vendor/league/commonmark-ext-table/src/TableCellRenderer.php b/vendor/league/commonmark/src/Extension/Table/TableCellRenderer.php
index 400e94e546..c149633efa 100644
--- a/vendor/league/commonmark-ext-table/src/TableCellRenderer.php
+++ b/vendor/league/commonmark/src/Extension/Table/TableCellRenderer.php
@@ -3,7 +3,7 @@
 declare(strict_types=1);
 
 /*
- * This is part of the league/commonmark-ext-table package.
+ * This is part of the league/commonmark package.
  *
  * (c) Martin Hasoň <martin.hason@gmail.com>
  * (c) Webuni s.r.o. <info@webuni.cz>
@@ -13,7 +13,7 @@ declare(strict_types=1);
  * file that was distributed with this source code.
  */
 
-namespace League\CommonMark\Ext\Table;
+namespace League\CommonMark\Extension\Table;
 
 use League\CommonMark\Block\Element\AbstractBlock;
 use League\CommonMark\Block\Renderer\BlockRendererInterface;
@@ -25,13 +25,13 @@ final class TableCellRenderer implements BlockRendererInterface
     public function render(AbstractBlock $block, ElementRendererInterface $htmlRenderer, bool $inTightList = false)
     {
         if (!$block instanceof TableCell) {
-            throw new \InvalidArgumentException('Incompatible block type: '.get_class($block));
+            throw new \InvalidArgumentException('Incompatible block type: ' . get_class($block));
         }
 
         $attrs = $block->getData('attributes', []);
 
         if ($block->align) {
-            $attrs['style'] = (isset($attrs['style']) ? $attrs['style'].' ' : '').'text-align: '.$block->align;
+            $attrs['align'] = $block->align;
         }
 
         return new HtmlElement($block->type, $attrs, $htmlRenderer->renderInlines($block->children()));
diff --git a/vendor/league/commonmark-ext-table/src/TableExtension.php b/vendor/league/commonmark/src/Extension/Table/TableExtension.php
index b19ee4dc03..0046b1bea6 100644
--- a/vendor/league/commonmark-ext-table/src/TableExtension.php
+++ b/vendor/league/commonmark/src/Extension/Table/TableExtension.php
@@ -3,7 +3,7 @@
 declare(strict_types=1);
 
 /*
- * This is part of the league/commonmark-ext-table package.
+ * This is part of the league/commonmark package.
  *
  * (c) Martin Hasoň <martin.hason@gmail.com>
  * (c) Webuni s.r.o. <info@webuni.cz>
@@ -13,7 +13,7 @@ declare(strict_types=1);
  * file that was distributed with this source code.
  */
 
-namespace League\CommonMark\Ext\Table;
+namespace League\CommonMark\Extension\Table;
 
 use League\CommonMark\ConfigurableEnvironmentInterface;
 use League\CommonMark\Extension\ExtensionInterface;
@@ -26,7 +26,6 @@ final class TableExtension implements ExtensionInterface
             ->addBlockParser(new TableParser())
 
             ->addBlockRenderer(Table::class, new TableRenderer())
-            ->addBlockRenderer(TableCaption::class, new TableCaptionRenderer())
             ->addBlockRenderer(TableSection::class, new TableSectionRenderer())
             ->addBlockRenderer(TableRow::class, new TableRowRenderer())
             ->addBlockRenderer(TableCell::class, new TableCellRenderer())
diff --git a/vendor/league/commonmark/src/Extension/Table/TableParser.php b/vendor/league/commonmark/src/Extension/Table/TableParser.php
new file mode 100644
index 0000000000..4f53fca56a
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/Table/TableParser.php
@@ -0,0 +1,274 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * This is part of the league/commonmark package.
+ *
+ * (c) Martin Hasoň <martin.hason@gmail.com>
+ * (c) Webuni s.r.o. <info@webuni.cz>
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\Table;
+
+use League\CommonMark\Block\Element\Document;
+use League\CommonMark\Block\Element\Paragraph;
+use League\CommonMark\Block\Parser\BlockParserInterface;
+use League\CommonMark\Context;
+use League\CommonMark\ContextInterface;
+use League\CommonMark\Cursor;
+use League\CommonMark\EnvironmentAwareInterface;
+use League\CommonMark\EnvironmentInterface;
+
+final class TableParser implements BlockParserInterface, EnvironmentAwareInterface
+{
+    /**
+     * @var EnvironmentInterface
+     */
+    private $environment;
+
+    public function parse(ContextInterface $context, Cursor $cursor): bool
+    {
+        $container = $context->getContainer();
+        if (!$container instanceof Paragraph) {
+            return false;
+        }
+
+        $lines = $container->getStrings();
+        if (count($lines) !== 1) {
+            return false;
+        }
+
+        if (\strpos($lines[0], '|') === false) {
+            return false;
+        }
+
+        $oldState = $cursor->saveState();
+        $cursor->advanceToNextNonSpaceOrTab();
+        $columns = $this->parseColumns($cursor);
+
+        if (empty($columns)) {
+            $cursor->restoreState($oldState);
+
+            return false;
+        }
+
+        $head = $this->parseRow(trim((string) array_pop($lines)), $columns, TableCell::TYPE_HEAD);
+        if (null === $head) {
+            $cursor->restoreState($oldState);
+
+            return false;
+        }
+
+        $table = new Table(function (Cursor $cursor, Table $table) use ($columns): bool {
+            // The next line cannot be a new block start
+            // This is a bit inefficient, but it's the only feasible way to check
+            // given the current v1 API.
+            if (self::isANewBlock($this->environment, $cursor->getLine())) {
+                return false;
+            }
+
+            $row = $this->parseRow(\trim($cursor->getLine()), $columns);
+            if (null === $row) {
+                return false;
+            }
+
+            $table->getBody()->appendChild($row);
+
+            return true;
+        });
+
+        $table->getHead()->appendChild($head);
+
+        if (count($lines) >= 1) {
+            $paragraph = new Paragraph();
+            foreach ($lines as $line) {
+                $paragraph->addLine($line);
+            }
+
+            $context->replaceContainerBlock($paragraph);
+            $context->addBlock($table);
+        } else {
+            $context->replaceContainerBlock($table);
+        }
+
+        return true;
+    }
+
+    private function parseRow(string $line, array $columns, string $type = TableCell::TYPE_BODY): ?TableRow
+    {
+        $cells = $this->split(new Cursor(\trim($line)));
+
+        if (empty($cells)) {
+            return null;
+        }
+
+        // The header row must match the delimiter row in the number of cells
+        if ($type === TableCell::TYPE_HEAD && \count($cells) !== \count($columns)) {
+            return null;
+        }
+
+        $i = 0;
+        $row = new TableRow();
+        foreach ($cells as $i => $cell) {
+            if (!array_key_exists($i, $columns)) {
+                return $row;
+            }
+
+            $row->appendChild(new TableCell(trim($cell), $type, $columns[$i]));
+        }
+
+        for ($j = count($columns) - 1; $j > $i; --$j) {
+            $row->appendChild(new TableCell('', $type, null));
+        }
+
+        return $row;
+    }
+
+    private function split(Cursor $cursor): array
+    {
+        if ($cursor->getCharacter() === '|') {
+            $cursor->advanceBy(1);
+        }
+
+        $cells = [];
+        $sb = '';
+
+        while (!$cursor->isAtEnd()) {
+            switch ($c = $cursor->getCharacter()) {
+                case '\\':
+                    if ($cursor->peek() === '|') {
+                        // Pipe is special for table parsing. An escaped pipe doesn't result in a new cell, but is
+                        // passed down to inline parsing as an unescaped pipe. Note that that applies even for the `\|`
+                        // in an input like `\\|` - in other words, table parsing doesn't support escaping backslashes.
+                        $sb .= '|';
+                        $cursor->advanceBy(1);
+                    } else {
+                        // Preserve backslash before other characters or at end of line.
+                        $sb .= '\\';
+                    }
+                    break;
+                case '|':
+                    $cells[] = $sb;
+                    $sb = '';
+                    break;
+                default:
+                    $sb .= $c;
+            }
+            $cursor->advanceBy(1);
+        }
+
+        if ($sb !== '') {
+            $cells[] = $sb;
+        }
+
+        return $cells;
+    }
+
+    /**
+     * @param Cursor $cursor
+     *
+     * @return array
+     */
+    private function parseColumns(Cursor $cursor): array
+    {
+        $columns = [];
+        $pipes = 0;
+        $valid = false;
+
+        while (!$cursor->isAtEnd()) {
+            switch ($c = $cursor->getCharacter()) {
+                case '|':
+                    $cursor->advanceBy(1);
+                    $pipes++;
+                    if ($pipes > 1) {
+                        // More than one adjacent pipe not allowed
+                        return [];
+                    }
+
+                    // Need at least one pipe, even for a one-column table
+                    $valid = true;
+                    break;
+                case '-':
+                case ':':
+                    if ($pipes === 0 && !empty($columns)) {
+                        // Need a pipe after the first column (first column doesn't need to start with one)
+                        return [];
+                    }
+                    $left = false;
+                    $right = false;
+                    if ($c === ':') {
+                        $left = true;
+                        $cursor->advanceBy(1);
+                    }
+                    if ($cursor->match('/^-+/') === null) {
+                        // Need at least one dash
+                        return [];
+                    }
+                    if ($cursor->getCharacter() === ':') {
+                        $right = true;
+                        $cursor->advanceBy(1);
+                    }
+                    $columns[] = $this->getAlignment($left, $right);
+                    // Next, need another pipe
+                    $pipes = 0;
+                    break;
+                case ' ':
+                case "\t":
+                    // White space is allowed between pipes and columns
+                    $cursor->advanceToNextNonSpaceOrTab();
+                    break;
+                default:
+                    // Any other character is invalid
+                    return [];
+            }
+        }
+
+        if (!$valid) {
+            return [];
+        }
+
+        return $columns;
+    }
+
+    private static function getAlignment(bool $left, bool $right): ?string
+    {
+        if ($left && $right) {
+            return TableCell::ALIGN_CENTER;
+        } elseif ($left) {
+            return TableCell::ALIGN_LEFT;
+        } elseif ($right) {
+            return TableCell::ALIGN_RIGHT;
+        }
+
+        return null;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function setEnvironment(EnvironmentInterface $environment)
+    {
+        $this->environment = $environment;
+    }
+
+    private static function isANewBlock(EnvironmentInterface $environment, string $line): bool
+    {
+        $context = new Context(new Document(), $environment);
+        $context->setNextLine($line);
+        $cursor = new Cursor($line);
+
+        /** @var BlockParserInterface $parser */
+        foreach ($environment->getBlockParsers() as $parser) {
+            if ($parser->parse($context, $cursor)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}
diff --git a/vendor/league/commonmark-ext-table/src/TableRenderer.php b/vendor/league/commonmark/src/Extension/Table/TableRenderer.php
index 2381780dad..1d414c6162 100644
--- a/vendor/league/commonmark-ext-table/src/TableRenderer.php
+++ b/vendor/league/commonmark/src/Extension/Table/TableRenderer.php
@@ -3,7 +3,7 @@
 declare(strict_types=1);
 
 /*
- * This is part of the league/commonmark-ext-table package.
+ * This is part of the league/commonmark package.
  *
  * (c) Martin Hasoň <martin.hason@gmail.com>
  * (c) Webuni s.r.o. <info@webuni.cz>
@@ -13,7 +13,7 @@ declare(strict_types=1);
  * file that was distributed with this source code.
  */
 
-namespace League\CommonMark\Ext\Table;
+namespace League\CommonMark\Extension\Table;
 
 use League\CommonMark\Block\Element\AbstractBlock;
 use League\CommonMark\Block\Renderer\BlockRendererInterface;
@@ -25,13 +25,15 @@ final class TableRenderer implements BlockRendererInterface
     public function render(AbstractBlock $block, ElementRendererInterface $htmlRenderer, bool $inTightList = false)
     {
         if (!$block instanceof Table) {
-            throw new \InvalidArgumentException('Incompatible block type: '.get_class($block));
+            throw new \InvalidArgumentException('Incompatible block type: ' . get_class($block));
         }
 
         $attrs = $block->getData('attributes', []);
 
         $separator = $htmlRenderer->getOption('inner_separator', "\n");
 
-        return new HtmlElement('table', $attrs, $separator.$htmlRenderer->renderBlocks($block->children()).$separator);
+        $children = $htmlRenderer->renderBlocks($block->children());
+
+        return new HtmlElement('table', $attrs, $separator . \trim($children) . $separator);
     }
 }
diff --git a/vendor/league/commonmark-ext-table/src/TableRow.php b/vendor/league/commonmark/src/Extension/Table/TableRow.php
index 17b5e96598..1447725949 100644
--- a/vendor/league/commonmark-ext-table/src/TableRow.php
+++ b/vendor/league/commonmark/src/Extension/Table/TableRow.php
@@ -3,7 +3,7 @@
 declare(strict_types=1);
 
 /*
- * This is part of the league/commonmark-ext-table package.
+ * This is part of the league/commonmark package.
  *
  * (c) Martin Hasoň <martin.hason@gmail.com>
  * (c) Webuni s.r.o. <info@webuni.cz>
@@ -13,14 +13,13 @@ declare(strict_types=1);
  * file that was distributed with this source code.
  */
 
-namespace League\CommonMark\Ext\Table;
+namespace League\CommonMark\Extension\Table;
 
 use League\CommonMark\Block\Element\AbstractBlock;
-use League\CommonMark\ContextInterface;
 use League\CommonMark\Cursor;
 use League\CommonMark\Node\Node;
 
-class TableRow extends AbstractBlock
+final class TableRow extends AbstractBlock
 {
     public function canContain(AbstractBlock $block): bool
     {
@@ -42,6 +41,8 @@ class TableRow extends AbstractBlock
      */
     public function children(): iterable
     {
-        return array_filter((array) parent::children(), static function (Node $child): bool { return $child instanceof AbstractBlock; });
+        return array_filter((array) parent::children(), static function (Node $child): bool {
+            return $child instanceof AbstractBlock;
+        });
     }
 }
diff --git a/vendor/league/commonmark-ext-table/src/TableRowRenderer.php b/vendor/league/commonmark/src/Extension/Table/TableRowRenderer.php
index 9f4d852e1b..dbbcd13238 100644
--- a/vendor/league/commonmark-ext-table/src/TableRowRenderer.php
+++ b/vendor/league/commonmark/src/Extension/Table/TableRowRenderer.php
@@ -3,7 +3,7 @@
 declare(strict_types=1);
 
 /*
- * This is part of the league/commonmark-ext-table package.
+ * This is part of the league/commonmark package.
  *
  * (c) Martin Hasoň <martin.hason@gmail.com>
  * (c) Webuni s.r.o. <info@webuni.cz>
@@ -13,7 +13,7 @@ declare(strict_types=1);
  * file that was distributed with this source code.
  */
 
-namespace League\CommonMark\Ext\Table;
+namespace League\CommonMark\Extension\Table;
 
 use League\CommonMark\Block\Element\AbstractBlock;
 use League\CommonMark\Block\Renderer\BlockRendererInterface;
@@ -25,13 +25,13 @@ final class TableRowRenderer implements BlockRendererInterface
     public function render(AbstractBlock $block, ElementRendererInterface $htmlRenderer, bool $inTightList = false)
     {
         if (!$block instanceof TableRow) {
-            throw new \InvalidArgumentException('Incompatible block type: '.get_class($block));
+            throw new \InvalidArgumentException('Incompatible block type: ' . get_class($block));
         }
 
         $attrs = $block->getData('attributes', []);
 
         $separator = $htmlRenderer->getOption('inner_separator', "\n");
 
-        return new HtmlElement('tr', $attrs, $separator.$htmlRenderer->renderBlocks($block->children()).$separator);
+        return new HtmlElement('tr', $attrs, $separator . $htmlRenderer->renderBlocks($block->children()) . $separator);
     }
 }
diff --git a/vendor/league/commonmark-ext-table/src/TableSection.php b/vendor/league/commonmark/src/Extension/Table/TableSection.php
index b19e4274dc..5d299a1625 100644
--- a/vendor/league/commonmark-ext-table/src/TableSection.php
+++ b/vendor/league/commonmark/src/Extension/Table/TableSection.php
@@ -3,7 +3,7 @@
 declare(strict_types=1);
 
 /*
- * This is part of the league/commonmark-ext-table package.
+ * This is part of the league/commonmark package.
  *
  * (c) Martin Hasoň <martin.hason@gmail.com>
  * (c) Webuni s.r.o. <info@webuni.cz>
@@ -13,7 +13,7 @@ declare(strict_types=1);
  * file that was distributed with this source code.
  */
 
-namespace League\CommonMark\Ext\Table;
+namespace League\CommonMark\Extension\Table;
 
 use League\CommonMark\Block\Element\AbstractBlock;
 use League\CommonMark\Block\Element\AbstractStringContainerBlock;
@@ -21,7 +21,7 @@ use League\CommonMark\Block\Element\InlineContainerInterface;
 use League\CommonMark\ContextInterface;
 use League\CommonMark\Cursor;
 
-class TableSection extends AbstractStringContainerBlock implements InlineContainerInterface
+final class TableSection extends AbstractStringContainerBlock implements InlineContainerInterface
 {
     const TYPE_HEAD = 'thead';
     const TYPE_BODY = 'tbody';
diff --git a/vendor/league/commonmark-ext-table/src/TableSectionRenderer.php b/vendor/league/commonmark/src/Extension/Table/TableSectionRenderer.php
index 7ea2a33fba..02e17d3caa 100644
--- a/vendor/league/commonmark-ext-table/src/TableSectionRenderer.php
+++ b/vendor/league/commonmark/src/Extension/Table/TableSectionRenderer.php
@@ -3,7 +3,7 @@
 declare(strict_types=1);
 
 /*
- * This is part of the league/commonmark-ext-table package.
+ * This is part of the league/commonmark package.
  *
  * (c) Martin Hasoň <martin.hason@gmail.com>
  * (c) Webuni s.r.o. <info@webuni.cz>
@@ -13,7 +13,7 @@ declare(strict_types=1);
  * file that was distributed with this source code.
  */
 
-namespace League\CommonMark\Ext\Table;
+namespace League\CommonMark\Extension\Table;
 
 use League\CommonMark\Block\Element\AbstractBlock;
 use League\CommonMark\Block\Renderer\BlockRendererInterface;
@@ -25,7 +25,7 @@ final class TableSectionRenderer implements BlockRendererInterface
     public function render(AbstractBlock $block, ElementRendererInterface $htmlRenderer, bool $inTightList = false)
     {
         if (!$block instanceof TableSection) {
-            throw new \InvalidArgumentException('Incompatible block type: '.get_class($block));
+            throw new \InvalidArgumentException('Incompatible block type: ' . get_class($block));
         }
 
         if (!$block->hasChildren()) {
@@ -36,6 +36,6 @@ final class TableSectionRenderer implements BlockRendererInterface
 
         $separator = $htmlRenderer->getOption('inner_separator', "\n");
 
-        return new HtmlElement($block->type, $attrs, $separator.$htmlRenderer->renderBlocks($block->children()).$separator);
+        return new HtmlElement($block->type, $attrs, $separator . $htmlRenderer->renderBlocks($block->children()) . $separator);
     }
 }
diff --git a/vendor/league/commonmark/src/Extension/TaskList/README.md b/vendor/league/commonmark/src/Extension/TaskList/README.md
new file mode 100644
index 0000000000..8d47593029
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/TaskList/README.md
@@ -0,0 +1,33 @@
+# GFM-style task list extension for `league/commonmark`
+
+This extension adds [GFM-style task list items][link-gfm-spec-task-lists] to the [`league/commonmark` Markdown parser for PHP][link-league-commonmark].
+
+## Usage
+
+Configure your `Environment` as usual and simply add the `TaskListExtension` provided by this package:
+
+```php
+use League\CommonMark\CommonMarkConverter;
+use League\CommonMark\Environment;
+use League\CommonMark\Extension\TaskList\TaskListExtension;
+
+// Obtain a pre-configured Environment with all the CommonMark parsers/renderers ready-to-go
+$environment = Environment::createCommonMarkEnvironment();
+
+// Add this extension
+$environment->addExtension(new TaskListExtension());
+
+// Instantiate the converter engine and start converting some Markdown!
+$converter = new CommonMarkConverter([], $environment);
+
+$markdown = <<<EOT
+ - [x] Install this extension
+ - [ ] ???
+ - [ ] Profit!
+EOT;
+
+echo $converter->convertToHtml($markdown);
+```
+
+[link-league-commonmark]: https://github.com/thephpleague/commonmark
+[link-gfm-spec-task-lists]: https://github.github.com/gfm/#task-list-items-extension-
diff --git a/vendor/league/commonmark/src/Extension/TaskList/TaskListExtension.php b/vendor/league/commonmark/src/Extension/TaskList/TaskListExtension.php
new file mode 100644
index 0000000000..11611d315d
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/TaskList/TaskListExtension.php
@@ -0,0 +1,24 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\TaskList;
+
+use League\CommonMark\ConfigurableEnvironmentInterface;
+use League\CommonMark\Extension\ExtensionInterface;
+
+final class TaskListExtension implements ExtensionInterface
+{
+    public function register(ConfigurableEnvironmentInterface $environment)
+    {
+        $environment->addInlineParser(new TaskListItemMarkerParser(), 35);
+        $environment->addInlineRenderer(TaskListItemMarker::class, new TaskListItemMarkerRenderer());
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/TaskList/TaskListItemMarker.php b/vendor/league/commonmark/src/Extension/TaskList/TaskListItemMarker.php
new file mode 100644
index 0000000000..a6cf65dc6d
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/TaskList/TaskListItemMarker.php
@@ -0,0 +1,36 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\TaskList;
+
+use League\CommonMark\Inline\Element\AbstractInline;
+
+final class TaskListItemMarker extends AbstractInline
+{
+    protected $checked = false;
+
+    public function __construct(bool $isCompleted)
+    {
+        $this->checked = $isCompleted;
+    }
+
+    public function isChecked(): bool
+    {
+        return $this->checked;
+    }
+
+    public function setChecked(bool $checked): self
+    {
+        $this->checked = $checked;
+
+        return $this;
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/TaskList/TaskListItemMarkerParser.php b/vendor/league/commonmark/src/Extension/TaskList/TaskListItemMarkerParser.php
new file mode 100644
index 0000000000..24491b1680
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/TaskList/TaskListItemMarkerParser.php
@@ -0,0 +1,63 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\TaskList;
+
+use League\CommonMark\Block\Element\ListItem;
+use League\CommonMark\Block\Element\Paragraph;
+use League\CommonMark\Inline\Parser\InlineParserInterface;
+use League\CommonMark\InlineParserContext;
+
+final class TaskListItemMarkerParser implements InlineParserInterface
+{
+    /**
+     * @return string[]
+     */
+    public function getCharacters(): array
+    {
+        return ['['];
+    }
+
+    /**
+     * @param InlineParserContext $inlineContext
+     *
+     * @return bool
+     */
+    public function parse(InlineParserContext $inlineContext): bool
+    {
+        $container = $inlineContext->getContainer();
+
+        // Checkbox must come at the beginning of the first paragraph of the list item
+        if ($container->hasChildren() || !($container instanceof Paragraph && $container->parent() && $container->parent() instanceof ListItem)) {
+            return false;
+        }
+
+        $cursor = $inlineContext->getCursor();
+        $oldState = $cursor->saveState();
+
+        $m = $cursor->match('/\[[ xX]\]/');
+        if ($m === null) {
+            return false;
+        }
+
+        if ($cursor->getNextNonSpaceCharacter() === null) {
+            $cursor->restoreState($oldState);
+
+            return false;
+        }
+
+        $isChecked = $m !== '[ ]';
+
+        $container->appendChild(new TaskListItemMarker($isChecked));
+
+        return true;
+    }
+}
diff --git a/vendor/league/commonmark/src/Extension/TaskList/TaskListItemMarkerRenderer.php b/vendor/league/commonmark/src/Extension/TaskList/TaskListItemMarkerRenderer.php
new file mode 100644
index 0000000000..a65513adc1
--- /dev/null
+++ b/vendor/league/commonmark/src/Extension/TaskList/TaskListItemMarkerRenderer.php
@@ -0,0 +1,44 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark\Extension\TaskList;
+
+use League\CommonMark\ElementRendererInterface;
+use League\CommonMark\HtmlElement;
+use League\CommonMark\Inline\Element\AbstractInline;
+use League\CommonMark\Inline\Renderer\InlineRendererInterface;
+
+final class TaskListItemMarkerRenderer implements InlineRendererInterface
+{
+    /**
+     * @param AbstractInline           $inline
+     * @param ElementRendererInterface $htmlRenderer
+     *
+     * @return HtmlElement|string|null
+     */
+    public function render(AbstractInline $inline, ElementRendererInterface $htmlRenderer)
+    {
+        if (!($inline instanceof TaskListItemMarker)) {
+            throw new \InvalidArgumentException('Incompatible inline type: ' . \get_class($inline));
+        }
+
+        $checkbox = new HtmlElement('input', [], '', true);
+
+        if ($inline->isChecked()) {
+            $checkbox->setAttribute('checked', '');
+        }
+
+        $checkbox->setAttribute('disabled', '');
+        $checkbox->setAttribute('type', 'checkbox');
+
+        return $checkbox;
+    }
+}
diff --git a/vendor/league/commonmark/src/GithubFlavoredMarkdownConverter.php b/vendor/league/commonmark/src/GithubFlavoredMarkdownConverter.php
new file mode 100644
index 0000000000..ef4b5946a1
--- /dev/null
+++ b/vendor/league/commonmark/src/GithubFlavoredMarkdownConverter.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of the league/commonmark package.
+ *
+ * (c) Colin O'Dell <colinodell@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace League\CommonMark;
+
+/**
+ * Converts Github Flavored Markdown to HTML.
+ */
+class GithubFlavoredMarkdownConverter extends CommonMarkConverter
+{
+    /**
+     * Create a new commonmark converter instance.
+     *
+     * @param array                     $config
+     * @param EnvironmentInterface|null $environment
+     */
+    public function __construct(array $config = [], EnvironmentInterface $environment = null)
+    {
+        if ($environment === null) {
+            $environment = Environment::createGFMEnvironment();
+        }
+
+        parent::__construct($config, $environment);
+    }
+}
diff --git a/vendor/league/commonmark/src/HtmlElement.php b/vendor/league/commonmark/src/HtmlElement.php
index 19f997538c..93f1046305 100644
--- a/vendor/league/commonmark/src/HtmlElement.php
+++ b/vendor/league/commonmark/src/HtmlElement.php
@@ -137,6 +137,8 @@ class HtmlElement
 
         if ($this->contents !== '') {
             $result .= '>' . $this->getContentsAsString() . '</' . $this->tagName . '>';
+        } elseif ($this->selfClosing && $this->tagName === 'input') {
+            $result .= '>';
         } elseif ($this->selfClosing) {
             $result .= ' />';
         } else {
diff --git a/vendor/league/commonmark/src/Inline/Parser/BacktickParser.php b/vendor/league/commonmark/src/Inline/Parser/BacktickParser.php
index 608fa7b86a..896771e494 100644
--- a/vendor/league/commonmark/src/Inline/Parser/BacktickParser.php
+++ b/vendor/league/commonmark/src/Inline/Parser/BacktickParser.php
@@ -38,9 +38,6 @@ final class BacktickParser implements InlineParserInterface
         $cursor = $inlineContext->getCursor();
 
         $ticks = $cursor->match('/^`+/');
-        if ($ticks === '') {
-            return false;
-        }
 
         $currentPosition = $cursor->getPosition();
         $previousState = $cursor->saveState();
@@ -53,7 +50,7 @@ final class BacktickParser implements InlineParserInterface
 
                 if (
                     !empty($c) &&
-                    \substr($c, 0, 1) === ' ' &&
+                    $c[0] === ' ' &&
                     \substr($c, -1, 1) === ' ' &&
                     \preg_match('/[^ ]/', $c)
                 ) {
diff --git a/vendor/league/commonmark/src/Inline/Parser/CloseBracketParser.php b/vendor/league/commonmark/src/Inline/Parser/CloseBracketParser.php
index 03c57ee648..f187e27686 100644
--- a/vendor/league/commonmark/src/Inline/Parser/CloseBracketParser.php
+++ b/vendor/league/commonmark/src/Inline/Parser/CloseBracketParser.php
@@ -68,7 +68,7 @@ final class CloseBracketParser implements InlineParserInterface, EnvironmentAwar
         $startPos = $cursor->getPosition();
         $previousState = $cursor->saveState();
 
-        $cursor->advance();
+        $cursor->advanceBy(1);
 
         // Check to see if we have a link/image
         if (!($link = $this->tryParseLink($cursor, $inlineContext->getReferenceMap(), $opener, $startPos))) {
@@ -149,7 +149,7 @@ final class CloseBracketParser implements InlineParserInterface, EnvironmentAwar
 
         $previousState = $cursor->saveState();
 
-        $cursor->advance();
+        $cursor->advanceBy(1);
         $cursor->advanceToNextNonSpaceOrNewline();
         if (($dest = LinkParserHelper::parseLinkDestination($cursor)) === null) {
             $cursor->restoreState($previousState);
@@ -167,12 +167,14 @@ final class CloseBracketParser implements InlineParserInterface, EnvironmentAwar
 
         $cursor->advanceToNextNonSpaceOrNewline();
 
-        if ($cursor->match('/^\\)/') === null) {
+        if ($cursor->getCharacter() !== ')') {
             $cursor->restoreState($previousState);
 
             return false;
         }
 
+        $cursor->advanceBy(1);
+
         return ['url' => $dest, 'title' => $title];
     }
 
diff --git a/vendor/league/commonmark/src/Inline/Parser/EscapableParser.php b/vendor/league/commonmark/src/Inline/Parser/EscapableParser.php
index 6bbaf435dd..6da015e99e 100644
--- a/vendor/league/commonmark/src/Inline/Parser/EscapableParser.php
+++ b/vendor/league/commonmark/src/Inline/Parser/EscapableParser.php
@@ -37,10 +37,6 @@ final class EscapableParser implements InlineParserInterface
     public function parse(InlineParserContext $inlineContext): bool
     {
         $cursor = $inlineContext->getCursor();
-        if ($cursor->getCharacter() !== '\\') {
-            return false;
-        }
-
         $nextChar = $cursor->peek();
 
         if ($nextChar === "\n") {
@@ -55,7 +51,7 @@ final class EscapableParser implements InlineParserInterface
             return true;
         }
 
-        $cursor->advance();
+        $cursor->advanceBy(1);
         $inlineContext->getContainer()->appendChild(new Text('\\'));
 
         return true;
diff --git a/vendor/league/commonmark/src/Inline/Parser/HtmlInlineParser.php b/vendor/league/commonmark/src/Inline/Parser/HtmlInlineParser.php
index 8f0650ec8a..5dc52e11a4 100644
--- a/vendor/league/commonmark/src/Inline/Parser/HtmlInlineParser.php
+++ b/vendor/league/commonmark/src/Inline/Parser/HtmlInlineParser.php
@@ -35,8 +35,7 @@ final class HtmlInlineParser implements InlineParserInterface
      */
     public function parse(InlineParserContext $inlineContext): bool
     {
-        $cursor = $inlineContext->getCursor();
-        if ($m = $cursor->match('/^' . RegexHelper::PARTIAL_HTMLTAG . '/i')) {
+        if ($m = $inlineContext->getCursor()->match('/^' . RegexHelper::PARTIAL_HTMLTAG . '/i')) {
             $inlineContext->getContainer()->appendChild(new HtmlInline($m));
 
             return true;
diff --git a/vendor/league/commonmark/src/Inline/Parser/NewlineParser.php b/vendor/league/commonmark/src/Inline/Parser/NewlineParser.php
index 6ac4077733..d32e8a37b4 100644
--- a/vendor/league/commonmark/src/Inline/Parser/NewlineParser.php
+++ b/vendor/league/commonmark/src/Inline/Parser/NewlineParser.php
@@ -35,12 +35,12 @@ final class NewlineParser implements InlineParserInterface
      */
     public function parse(InlineParserContext $inlineContext): bool
     {
-        $inlineContext->getCursor()->advance();
+        $inlineContext->getCursor()->advanceBy(1);
 
         // Check previous inline for trailing spaces
         $spaces = 0;
         $lastInline = $inlineContext->getContainer()->lastChild();
-        if ($lastInline && $lastInline instanceof Text) {
+        if ($lastInline instanceof Text) {
             $trimmed = \rtrim($lastInline->getContent(), ' ');
             $spaces = \strlen($lastInline->getContent()) - \strlen($trimmed);
             if ($spaces) {
diff --git a/vendor/league/commonmark/src/Inline/Parser/OpenBracketParser.php b/vendor/league/commonmark/src/Inline/Parser/OpenBracketParser.php
index d11edc3039..06f52c84c4 100644
--- a/vendor/league/commonmark/src/Inline/Parser/OpenBracketParser.php
+++ b/vendor/league/commonmark/src/Inline/Parser/OpenBracketParser.php
@@ -35,11 +35,7 @@ final class OpenBracketParser implements InlineParserInterface
      */
     public function parse(InlineParserContext $inlineContext): bool
     {
-        if ($inlineContext->getCursor()->getCharacter() !== '[') {
-            return false;
-        }
-
-        $inlineContext->getCursor()->advance();
+        $inlineContext->getCursor()->advanceBy(1);
         $node = new Text('[', ['delim' => true]);
         $inlineContext->getContainer()->appendChild($node);
 
diff --git a/vendor/league/commonmark/src/InlineParserEngine.php b/vendor/league/commonmark/src/InlineParserEngine.php
index f7d4b086d5..46469b3795 100644
--- a/vendor/league/commonmark/src/InlineParserEngine.php
+++ b/vendor/league/commonmark/src/InlineParserEngine.php
@@ -42,7 +42,8 @@ final class InlineParserEngine
     public function parse(AbstractStringContainerBlock $container, ReferenceMapInterface $referenceMap)
     {
         $inlineParserContext = new InlineParserContext($container, $referenceMap);
-        while (($character = $inlineParserContext->getCursor()->getCharacter()) !== null) {
+        $cursor = $inlineParserContext->getCursor();
+        while (($character = $cursor->getCharacter()) !== null) {
             if (!$this->parseCharacter($character, $inlineParserContext)) {
                 $this->addPlainText($character, $container, $inlineParserContext);
             }
@@ -76,10 +77,10 @@ final class InlineParserEngine
 
     private function parseDelimiters(DelimiterProcessorInterface $delimiterProcessor, InlineParserContext $inlineContext): bool
     {
-        $character = $inlineContext->getCursor()->getCharacter();
+        $cursor = $inlineContext->getCursor();
+        $character = $cursor->getCharacter();
         $numDelims = 0;
 
-        $cursor = $inlineContext->getCursor();
         $charBefore = $cursor->peek(-1);
         if ($charBefore === null) {
             $charBefore = "\n";
@@ -102,7 +103,7 @@ final class InlineParserEngine
 
         list($canOpen, $canClose) = self::determineCanOpenOrClose($charBefore, $charAfter, $character, $delimiterProcessor);
 
-        $node = new Text($cursor->getPreviousText(), [
+        $node = new Text(\str_repeat($character, $numDelims), [
             'delim' => true,
         ]);
         $inlineContext->getContainer()->appendChild($node);
@@ -140,7 +141,7 @@ final class InlineParserEngine
         $text = $inlineParserContext->getCursor()->match($this->environment->getInlineParserCharacterRegex());
         // This might fail if we're currently at a special character which wasn't parsed; if so, just add that character
         if ($text === null) {
-            $inlineParserContext->getCursor()->advance();
+            $inlineParserContext->getCursor()->advanceBy(1);
             $text = $character;
         }
 
diff --git a/vendor/league/commonmark/src/Reference/ReferenceParser.php b/vendor/league/commonmark/src/Reference/ReferenceParser.php
index c9bea6b571..fb250e2a86 100644
--- a/vendor/league/commonmark/src/Reference/ReferenceParser.php
+++ b/vendor/league/commonmark/src/Reference/ReferenceParser.php
@@ -67,7 +67,7 @@ final class ReferenceParser
         }
 
         // Advance past the colon
-        $cursor->advance();
+        $cursor->advanceBy(1);
 
         // Link URL
         $cursor->advanceToNextNonSpaceOrNewline();
diff --git a/vendor/league/commonmark/src/Util/LinkParserHelper.php b/vendor/league/commonmark/src/Util/LinkParserHelper.php
index bfb01d5e08..95355a2f00 100644
--- a/vendor/league/commonmark/src/Util/LinkParserHelper.php
+++ b/vendor/league/commonmark/src/Util/LinkParserHelper.php
@@ -98,22 +98,22 @@ final class LinkParserHelper
 
         $openParens = 0;
         while (($c = $cursor->getCharacter()) !== null) {
-            if ($c === '\\' && RegexHelper::isEscapable($cursor->peek())) {
+            if ($c === '\\' && $cursor->peek() !== null && RegexHelper::isEscapable($cursor->peek())) {
                 $cursor->advanceBy(2);
             } elseif ($c === '(') {
-                $cursor->advance();
+                $cursor->advanceBy(1);
                 $openParens++;
             } elseif ($c === ')') {
                 if ($openParens < 1) {
                     break;
                 }
 
-                $cursor->advance();
+                $cursor->advanceBy(1);
                 $openParens--;
             } elseif (\preg_match(RegexHelper::REGEX_WHITESPACE_CHAR, $c)) {
                 break;
             } else {
-                $cursor->advance();
+                $cursor->advanceBy(1);
             }
         }
 
diff --git a/vendor/league/flysystem/composer.json b/vendor/league/flysystem/composer.json
index 92ab3889eb..72b0787c26 100644
--- a/vendor/league/flysystem/composer.json
+++ b/vendor/league/flysystem/composer.json
@@ -20,7 +20,7 @@
     },
     "require-dev": {
         "phpspec/phpspec": "^3.4",
-        "phpunit/phpunit": "^5.7.10"
+        "phpunit/phpunit": "^5.7.26"
     },
     "autoload": {
         "psr-4": {
diff --git a/vendor/league/flysystem/src/Adapter/AbstractFtpAdapter.php b/vendor/league/flysystem/src/Adapter/AbstractFtpAdapter.php
index fb8aa49cfa..95a6b4d09e 100644
--- a/vendor/league/flysystem/src/Adapter/AbstractFtpAdapter.php
+++ b/vendor/league/flysystem/src/Adapter/AbstractFtpAdapter.php
@@ -558,7 +558,7 @@ abstract class AbstractFtpAdapter extends AbstractAdapter
     protected function normalizePermissions($permissions)
     {
         if (is_numeric($permissions)) {
-            return $permissions & 0777;
+            return ((int) $permissions) & 0777;
         }
 
         // remove the type identifier
diff --git a/vendor/league/flysystem/src/Adapter/Ftp.php b/vendor/league/flysystem/src/Adapter/Ftp.php
index cdaf711b21..7dfcc2b051 100644
--- a/vendor/league/flysystem/src/Adapter/Ftp.php
+++ b/vendor/league/flysystem/src/Adapter/Ftp.php
@@ -532,15 +532,8 @@ class Ftp extends AbstractFtpAdapter
      */
     public function isConnected()
     {
-        try {
-            return is_resource($this->connection) && ftp_rawlist($this->connection, $this->getRoot()) !== false;
-        } catch (ErrorException $e) {
-            if (strpos($e->getMessage(), 'ftp_rawlist') === false) {
-                throw new ConnectionErrorException($e->getMessage());
-            }
-
-            return false;
-        }
+        return is_resource($this->connection)
+            && $this->getRawExecResponseCode('NOOP') === 200;
     }
 
     /**
@@ -571,4 +564,11 @@ class Ftp extends AbstractFtpAdapter
 
         return ftp_rawlist($connection, $options . ' ' . $path);
     }
+
+    private function getRawExecResponseCode($command)
+    {
+        $response = @ftp_raw($this->connection, trim($command));
+
+        return (int) preg_replace('/\D/', '', implode(' ', $response));
+    }
 }