[PHPUnit bridge] Bump php version of PHPUnit-bridge

src/Symfony/Bridge/PhpUnit/CHANGELOG.md

@@ -5,6 +5,7 @@ CHANGELOG
 -----
 
  * added `ClassExistsMock`
+ * bumped PHP version from 5.3.3 to 5.5.9 
 
 4.1.0
 -----

src/Symfony/Bridge/PhpUnit/composer.json

@@ -16,9 +16,9 @@
         }
     ],
     "require": {
-        "php": ">=5.3.3 EVEN ON LATEST SYMFONY VERSIONS TO ALLOW USING",
+        "php": ">=5.5.9 EVEN ON LATEST SYMFONY VERSIONS TO ALLOW USING",
         "php": "THIS BRIDGE WHEN TESTING LOWEST SYMFONY VERSIONS.",
-        "php": ">=5.3.3"
+        "php": ">=5.5.9"
     },
     "suggest": {
         "symfony/debug": "For tracking deprecated interfaces usages at runtime with DebugClassLoader",