add flow comment to index.js

jamiehodge · jamiehodge · commit ca3db88ea28a · 2017-04-25T12:35:22.000+02:00
diff --git a/src/index.js b/src/index.js
@@ -1,3 +1,4 @@
+/* @flow */
 /**
  *  Copyright (c) 2015, Facebook, Inc.
  *  All rights reserved.
