Allow sensio/framework-extra-bundle v4

Author: mattjanssen

composer.json

@@ -14,7 +14,7 @@
     "require": {
         "php": "^5.4|^7",
         "symfony/symfony": "^2.3|^3",
-        "sensio/framework-extra-bundle": "^3"
+        "sensio/framework-extra-bundle": "^3|^4"
     },
     "require-dev": {
         "phpunit/phpunit": "^4.0",