bumped min PHP version to 5.3.9

Author: fabpot

composer.json

@@ -16,7 +16,7 @@
         }
     ],
     "require": {
-        "php": ">=5.3.3",
+        "php": ">=5.3.9",
         "symfony/event-dispatcher": "~2.1|~3.0.0",
         "symfony/intl": "~2.3|~3.0.0",
         "symfony/options-resolver": "~2.6|~3.0.0",