Prepare release 3.3.0

Author: dmolineus

composer.json

@@ -66,9 +66,8 @@
   },
   "extra": {
     "branch-alias": {
-      "dev-develop": "3.3.x-dev",
-      "dev-master": "3.2.x-dev",
-      "dev-support/2.x": "2.1.x-dev"
+      "dev-develop": "3.4.x-dev",
+      "dev-master": "3.3.x-dev"
     },
     "contao-manager-plugin": "Hofff\\Contao\\RecursiveDownloadFolder\\ContaoManager\\Plugin"
   }