Remove branch alias (branch name is named in a way that matches)

Author: weierophinney

composer.json

@@ -18,10 +18,5 @@
         "psr-4": {
             "Psr\\Container\\": "src/"
         }
-    },
-    "extra": {
-        "branch-alias": {
-            "dev-master": "1.1.x-dev"
-        }
     }
 }