changed Symfony2 to Symfony

README.rst

 Silex, a simple Web Framework
 =============================
 
-Silex is a PHP micro-framework to develop websites based on `Symfony2
+Silex is a PHP micro-framework to develop websites based on `Symfony
 components`_:
 
 .. code-block:: php
@@ -57,7 +57,7 @@ License
 
 Silex is licensed under the MIT license.
 
-.. _Symfony2 components: http://symfony.com
+.. _Symfony components: http://symfony.com
 .. _Composer:           http://getcomposer.org
 .. _PHPUnit:            https://phpunit.de
 .. _silex.zip:          http://silex.sensiolabs.org/download

composer.json

 {
     "minimum-stability": "dev",
     "name": "silex/silex",
-    "description": "The PHP micro-framework based on the Symfony2 Components",
+    "description": "The PHP micro-framework based on the Symfony Components",
     "keywords": ["microframework"],
     "homepage": "http://silex.sensiolabs.org",
     "license": "MIT",