Minor cleanups

Author: nicolas-grekas

composer.json

@@ -66,7 +66,6 @@
         "symfony/asset": "<3.3",
         "symfony/console": "<3.3",
         "symfony/form": "<3.3",
-        "symfony/http-kernel": "<3.4",
         "symfony/property-info": "<3.3",
         "symfony/serializer": "<3.3",
         "symfony/translation": "<3.4",