Start development of version 4.4.x (#639)

Author: ste93cry

composer.json

@@ -97,7 +97,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "4.3.x-dev",
+            "dev-master": "4.4.x-dev",
             "releases/3.2.x": "3.2.x-dev",
             "releases/2.x": "2.x-dev",
             "releases/1.x": "1.x-dev"