Merge branch '4.4' into 5.1

* 4.4:
  Fix branch-version

Author: nicolas-grekas

composer.json

@@ -27,6 +27,6 @@
     },
     "minimum-stability": "dev",
     "extra": {
-        "branch-version": "5.1-dev"
+        "branch-version": "5.1"
     }
 }