Remove GraphQL from future plans.

doc/api/README.md

@@ -59,19 +59,6 @@ following locations:
 - [V3 to V4](v3_to_v4.md)
 - [Version](version.md)
-## Road to GraphQL
-
-Going forward, we will start on moving to
-[GraphQL](http://graphql.org/learn/best-practices/) and deprecate the use of
-controller-specific endpoints. GraphQL has a number of benefits:
-
-1. We avoid having to maintain two different APIs.
-2. Callers of the API can request only what they need.
-3. It is versioned by default.
-
-It will co-exist with the current v4 REST API. If we have a v5 API, this should
-be a compatibility layer on top of GraphQL.
-
 ## Basic usage
 API requests should be prefixed with `api` and the API version. The API version