remove symfony flex package reference in readme

Author: transistive

docs/README.md

@@ -14,15 +14,6 @@ Make sure Composer is installed globally, as explained in the
 [installation chapter](https://getcomposer.org/doc/00-intro.md)
 of the Composer documentation.
 
-Applications that use Symfony Flex
-----------------------------------
-
-Open a command console, enter your project directory and execute:
-
-```console
-$ composer require neo4j
-```
-
 Applications that don't use Symfony Flex
 ----------------------------------------