Upgrade dev dependencies

Author: greg0ire

composer.json

@@ -33,7 +33,7 @@
         "symfony/twig-bundle": "^2.8 || ^3.3 || ^4.0"
     },
     "require-dev": {
-        "symfony/phpunit-bridge": "^3.3 || ^4.0"
+        "symfony/phpunit-bridge": "^4.1"
     },
     "autoload": {
         "psr-4": {