minor #117 Abandon this bundle (bocharsky-bw)

This PR was squashed before being merged into the 1.5.x-dev branch.

Discussion
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Abandon this bundle

Closes #116

Commits
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091cff2 Abandon this bundle

README.markdown

@@ -1,3 +1,7 @@
+> **WARNING:** This bundle is **abandoned** in favor of [markdown_to_html](https://twig.symfony.com/doc/3.x/filters/markdown_to_html.html)
+> Twig filter. Please, consider using it instead. Migration should be easy because it also supports
+> `michelf/php-markdown` Markdown parser that is used in this project under the hood.
+
 Provide markdown conversion (based on [Michel Fortin work](https://github.com/michelf/php-markdown)) to your Symfony projects.
 
 [![Build Status](https://secure.travis-ci.org/KnpLabs/KnpMarkdownBundle.svg)](http://travis-ci.org/KnpLabs/KnpMarkdownBundle)

composer.json

@@ -29,6 +29,7 @@
         "phpstan/phpstan": "^1.2",
         "phpstan/phpstan-symfony": "^1.0"
     },
+    "abandoned": "twig/markdown-extra",
     "suggest": {
         "symfony/twig-bundle": "to use the Twig markdown filter",
         "ext-sundown": "to use optional support for php-sundown extension instead of php implementation"