fixed tests

Author: fabpot

composer.json

@@ -24,7 +24,7 @@
         "symfony/asset": "~2.8|~3.0|~4.0",
         "symfony/dependency-injection": "~2.8|~3.0|~4.0",
         "symfony/finder": "~2.8|~3.0|~4.0",
-        "symfony/form": "~3.4-beta2|~4.0",
+        "symfony/form": "~3.4-beta2|~4.0-beta2",
         "symfony/http-foundation": "^3.3.11|~4.0",
         "symfony/http-kernel": "~3.2|~4.0",
         "symfony/polyfill-intl-icu": "~1.0",