Prefer composer install instead for using Symfony Installer

Author: e-moe

README.md

@@ -10,8 +10,7 @@ Drupal and Magento).
 Installation
 ------------
 
-* [Install Symfony][4] with Composer or with our own installer (see
-  [requirements details][3]).
+* [Install Symfony][4] with Composer (see [requirements details][3]).
 * Symfony follows the [semantic versioning][5] strictly, publishes "Long Term
   Support" (LTS) versions and has a [release process][6] that is predictable and
   business-friendly.