Add the branch alias to composer.json

Author: alisonmonteiro

composer.json

@@ -13,5 +13,10 @@
 	},
 	"autoload": {
 		"classmap": ["src/"]
-	}
+	},
+    "extra": {
+        "branch-alias": {
+            "dev-master": "1.0.x-dev"
+        }
+    }
 }