Changed the default branch to main

Author: gplanchat

composer.json

@@ -44,7 +44,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "0.6.x-dev"
+            "dev-main": "0.6.x-dev"
         },
         "gyroscops": {
             "plugins": ["Kiboko\\Plugin\\FastMap\\Service"]