Add FastAPI and Starlette to integrations (#906)

Author: tiangolo

docs/index.rst

@@ -19,3 +19,5 @@ Integrations
 * `Graphene-SQLAlchemy <http://docs.graphene-python.org/projects/sqlalchemy/en/latest/>`_ (`source <https://github.com/graphql-python/graphene-sqlalchemy/>`_)
 * `Graphene-GAE <http://docs.graphene-python.org/projects/gae/en/latest/>`_ (`source <https://github.com/graphql-python/graphene-gae/>`_)
 * `Graphene-Mongo <http://graphene-mongo.readthedocs.io/en/latest/>`_ (`source <https://github.com/graphql-python/graphene-mongo>`_)
+* `Starlette <https://www.starlette.io/graphql/>`_ (`source <https://github.com/encode/starlette>`_)
+* `FastAPI <https://fastapi.tiangolo.com/tutorial/graphql/>`_ (`source <https://github.com/tiangolo/fastapi>`_)