Update branch alias (#315)

* Update branch alias

* Update branch alias to 0.9-dev

Author: XWB

composer.json

@@ -56,7 +56,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "0.7-dev"
+            "dev-master": "0.9-dev"
         }
     }
 }