Add a master branch alias to composer.json

Author: chervand

composer.json

@@ -38,5 +38,10 @@
     "psr-4": {
       "chervand\\yii2\\oauth2\\server\\": "/"
     }
+  },
+  "extra": {
+    "branch-alias": {
+      "dev-master": "1.0.x-dev"
+    }
   }
 }