Fixed invalid composer file

Nyholm · Nyholm · commit adf911475aa2 · 2017-06-23T08:55:05.000+02:00
diff --git a/composer.json b/composer.json
@@ -66,7 +66,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "2.0.0-RC1"
+            "dev-master": "2.0.0-dev"
         }
     },
     "config": {
