Merge pull request #150 from wp-cli/fix/adapt-branch-alias

Adapt branch alias to change from `master` to `main`

Author: schlessera

composer.json

@@ -29,7 +29,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "2.x-dev"
+            "dev-main": "2.x-dev"
         },
         "bundled": true,
         "commands": [