chore(Composer): update composer.json branch alias

Author: Jens Schulze

composer.json

@@ -76,8 +76,7 @@
   },
   "extra": {
     "branch-alias": {
-      "dev-develop": "1.7-dev",
-      "dev-version2": "2.0-dev"
+      "dev-develop": "2.0-dev"
     },
     "incenteev-parameters": [
       {