Removed unneeded dependencies

These dependencies are either no longer a dependency of this package, or
are already required with the same version constraints by other
packages.

Author: wouterj

composer.json

@@ -12,12 +12,9 @@
     "require": {
         "php": "^5.6|^7.0",
         "symfony/framework-bundle": "^2.8|^3.0",
-        "symfony/config": "^2.8|^3.0",
-        "symfony-cmf/routing-auto": "^2.0@dev",
+        "symfony-cmf/routing-auto": "^2.0",
         "symfony-cmf/routing-bundle": "^1.2.0|^2.0",
-        "symfony-cmf/slugifier-api": "^1.0",
-        "aferrandini/urlizer": "1.0.*",
-        "jms/metadata": "1.5.*"
+        "aferrandini/urlizer": "1.0.*"
     },
     "require-dev": {
         "symfony-cmf/testing": "^1.3|^2.0",