Update minimum version of PHP to 7.1

1 files changed, 8 insertions, 5 deletions

diff --git a/vendor/league/commonmark/README.md b/vendor/league/commonmark/README.md
index 0c08a9bd69..d58423646f 100644
--- a/vendor/league/commonmark/README.md
+++ b/vendor/league/commonmark/README.md
@@ -102,8 +102,10 @@ Documentation can be found at [commonmark.thephpleague.com][docs].
 - [Drupal 7 & 8](https://www.drupal.org/project/markdown)
 - [Laravel 4 & 5](https://github.com/GrahamCampbell/Laravel-Markdown)
 - [Sculpin](https://github.com/bcremer/sculpin-commonmark-bundle)
-- [Symfony](https://github.com/webuni/commonmark-bundle)
-- [Twig](https://github.com/webuni/commonmark-twig-renderer)
+- [Symfony 2 & 3](https://github.com/webuni/commonmark-bundle)
+- [Symfony 4](https://github.com/avensome/commonmark-bundle)
+- [Twig-based renderer](https://github.com/webuni/commonmark-twig-renderer)
+- [Twig filter and tag](https://github.com/aptoma/twig-markdown)
 
 ### CommonMark Extras
 
@@ -118,6 +120,7 @@ Custom parsers/renderers can be bundled into extensions which extend CommonMark.
  - [CommonMark Attributes Extension](https://github.com/webuni/commonmark-attributes-extension) - Adds a syntax to define attributes on the various HTML elements.
  - [Alt Three Emoji](https://github.com/AltThree/Emoji) An emoji parser for CommonMark.
  - [uafrica/commonmark-ext](https://github.com/uafrica/commonmark-ext) - Adds strikethrough support.
+ - [Sup Sub extensions](https://github.com/OWS/commonmark-sup-sub-extensions) - Adds support of superscript and subscript (`<sup>` and `<sub>` HTML tags)
 
 If you build your own, feel free to submit a PR to add it to this list!
 
@@ -151,17 +154,17 @@ $ ./tests/benchmark/benchmark.php
 
 ## Versioning
 
-[SemVer](http://semver.org/) will be followed closely.  0.x.0 versions will introduce breaking changes to the codebase, so be careful which version constraints you use. **It's highly recommended that you use [Composer's caret operator](https://getcomposer.org/doc/articles/versions.md#caret) to ensure compatibility**; for example: `^0.16`.  This is equivalent to `>=0.16.0 <0.17.0`.
+[SemVer](http://semver.org/) will be followed closely.  0.x.0 versions will introduce breaking changes to the codebase, so be careful which version constraints you use. **It's highly recommended that you use [Composer's caret operator](https://getcomposer.org/doc/articles/versions.md#caret) to ensure compatibility**; for example: `^0.18`.  This is equivalent to `>=0.18.0 <0.19.0`.
 
 0.x.y releases should not introduce breaking changes to the codebase; however, they might change the resulting AST or HTML output of parsed Markdown (due to bug fixes, minor spec changes, etc.)  As a result, you might get slightly different HTML, but any custom code built onto this library will still function correctly.
 
-If you're only using the `CommonMarkConverter` class to convert Markdown (no other class references, custom parsers, etc.), then it should be safe to use a broader constraint like `~0.16`, `>0.16`, etc.  I personally promise to never break this specific class in any future 0.x release.
+If you're only using the `CommonMarkConverter` class or `ConverterInterface` to convert Markdown (no other class references, custom parsers, etc.), then it should be safe to use a broader constraint like `~0.18`, `>0.18`, etc.  I personally promise to never break this specific class in any future 0.x release.
 
 ## Stability
 
 While this package does work well, the underlying code should not be considered "stable" yet.  The original spec and JS parser may undergo changes in the near future which will result in corresponding changes to this code.  Any methods tagged with `@api` are not expected to change, but other methods/classes might.
 
-Major release 1.0.0 will be reserved for when both CommonMark and this project are considered stable (see [outstanding CommonMark spec issues](http://talk.commonmark.org/t/issues-to-resolve-before-1-0-release/1287)).  0.x.y will be used until that happens.
+Major release 1.0.0 will be reserved for when either the CommonMark spec or this project are considered stable (see [outstanding CommonMark spec issues](http://talk.commonmark.org/t/issues-to-resolve-before-1-0-release/1287)).  0.x.y will be used until that happens.
 
 ## Contributing