Update README.md

Mention that Graphene works great with both Relay and Apollo

Author: helfer

README.md

@@ -8,7 +8,7 @@ Please read [UPGRADE-v1.0.md](/UPGRADE-v1.0.md) to learn how to upgrade to Graph
 [Graphene](http://graphene-python.org) is a Python library for building GraphQL schemas/types fast and easily.
 
 - **Easy to use:** Graphene helps you use GraphQL in Python without effort.
-- **Relay:** Graphene has builtin support for Relay
+- **Relay & Apollo:** Graphene has builtin support for both [Apollo](https://github.com/apollographql/apollo-client) and [Relay](https://github.com/facebook/relay)
 - **Data agnostic:** Graphene supports any kind of data source: SQL (Django, SQLAlchemy), NoSQL, custom Python objects, etc.
   We believe that by providing a complete API you could plug Graphene anywhere your data lives and make your data available
   through GraphQL.