Update README.md

Author: reedy

README.md

@@ -11,6 +11,8 @@ select "Set from..." and select "MediaWiki".
 
 Note, this doesn't provide MediaWiki file or Wikitext syntax highlighting support.
 
+The code style support is now somewhere deprecated now that IntelliJ supports [`mediawiki/mediawiki-codesniffer`](https://www.jetbrains.com/help/idea/using-php-code-sniffer.html#enabling-tool-inspection).
+
 [JetBrains Plugin Repository :: MediaWiki Support](http://plugins.jetbrains.com/plugin/7439)
 
 License : GNU GPL v2 or later