requiree new testing component, to get newer Version, means RC1 (#221)

Author: ElectricMaxxx

composer.json

@@ -25,7 +25,7 @@
         "symfony/dependency-injection": "^2.8 || ^3.3 || ^4.0",
         "symfony/config": "^2.8 || ^3.3 || ^4.0",
         "symfony/event-dispatcher": "^2.8 || ^3.3 || ^4.0",
-        "symfony-cmf/testing": "^2.1@dev"
+        "symfony-cmf/testing": "^2.1.0-RC1"
     },
     "suggest": {
         "symfony/event-dispatcher": "DynamicRouter can optionally trigger an event at the start of matching. Minimal version (~2.1)"