Change the branch alias to dev-main (#64)

Author: danielbachhuber

composer.json

@@ -45,7 +45,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "1.x-dev"
+            "dev-main": "1.x-dev"
         },
         "commands": [
             "find"