Require SymfonyDITest 0.6 to have PHPunit 4 support

Author: wouterj

composer.json

@@ -21,7 +21,7 @@
     "require-dev": {
         "symfony-cmf/core-bundle": "~1.1",
         "symfony-cmf/testing": "~1.2,>=1.2.3",
-        "matthiasnoback/symfony-dependency-injection-test": "~0.3",
+        "matthiasnoback/symfony-dependency-injection-test": "~0.6",
         "matthiasnoback/symfony-config-test": "0.*",
         "sonata-project/doctrine-phpcr-admin-bundle": "~1.1",
         "symfony/monolog-bundle": "~2.3",