Bumped cmf testing version

Author: dantleech

composer.json

@@ -15,7 +15,7 @@
     },
     "require-dev": {
         "symfony/symfony": "~2.3 || ~3.0",
-        "symfony-cmf/testing": "~1.2"
+        "symfony-cmf/testing": "~1.3"
     },
     "autoload": {
         "psr-4": {