Update the branch alias

New features have been merged, so it is not 2.7.x anymore.

Author: stof

composer.json

@@ -34,7 +34,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "2.7.x-dev"
+            "dev-master": "2.8.x-dev"
         }
     }
 }