Update composer.json for Symfony 2.1

composer.json

@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": ">=5.3.2",
-        "symfony/framework-bundle": "2.0.*"
+        "symfony/framework-bundle": ">=2.0"
     },
     "autoload": {
         "psr-0": { "Mmoreramerino\\GearmanBundle": "" }