fix: alias master branch to 2.0.x

Not sure why merting #28 did not pick this up...

Author: weierophinney

composer.json

@@ -21,7 +21,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "1.1.x-dev"
+            "dev-master": "2.0.x-dev"
         }
     }
 }