Added branch-alias to the master branch

Author: lisachenko

composer.json

@@ -17,5 +17,10 @@
         "psr-4": {
             "Go\\Symfony\\GoAopBundle\\": "./"
         }
+    },
+    "extra": {
+        "branch-alias": {
+            "dev-master": "2.x-dev"
+        }
     }
 }