Composer: updated master to be 2.1-dev

Author: marc-mabe

composer.json

@@ -34,7 +34,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "2.0-dev",
+            "dev-master": "2.1-dev",
             "dev-1.x":    "1.2-dev"
         }
     }