Specify what Github Issues is for. Also test hook.

README.md

@@ -308,8 +308,8 @@ The query portion is executed after the mutation, so this would return `greg` as
 - Please see [this wiki page](https://github.com/dgraph-io/dgraph/wiki/Contributing-to-DGraph) for guidelines on contributions.
 
 ## Contact
-- Please use [discuss.dgraph.io](https://discuss.dgraph.io) for documentation, questions and discussions.
-- Please use [Github issue tracker](https://github.com/dgraph-io/dgraph/issues) to file bugs, or request features.
+- Please use [discuss.dgraph.io](https://discuss.dgraph.io) for documentation, questions, feature requests and discussions.
+- Please use [Github issue tracker](https://github.com/dgraph-io/dgraph/issues) **ONLY to file bugs.** Any feature request should go to discuss.
 - Or, just join [Gitter chat](https://gitter.im/dgraph-io/dgraph?utm_source=share-link&utm_medium=link&utm_campaign=share-link).
 
 ## Talks