docs(features): change readme for 'format code' (new extension PHP CS Fixer) (#252)

Author: mattwelke

README.md

@@ -40,9 +40,11 @@ I recommend to disable VS Code's built-in PHP IntelliSense by setting `php.sugge
 ### Column-accurate error reporting
 ![Error reporting demo](images/publishDiagnostics.png)
 
-### Format code
+### Code style linting
 Please use a dedicated extension like [PHP CodeSniffer](https://marketplace.visualstudio.com/items?itemName=ikappas.phpcs).
 
+### Format code
+Please use a dedicated extension like [PHP CS Fixer](https://marketplace.visualstudio.com/items?itemName=junstyle.php-cs-fixer).
 
 ## Todo
  - Rename