Merge branch '3.4' into 4.4

* 3.4:
  Update versions in composer.json

Author: nicolas-grekas

composer.json

@@ -51,5 +51,5 @@
         ]
     },
     "minimum-stability": "dev",
-    "version": "4.4-dev"
+    "version": "4.4.x-dev"
 }