[GraphQL] Update CHANGELOG announcing switch
@@ -11,6 +11,8 @@ Versioning](http://semver.org/spec/v2.0.0.html).
- CLI functionality for check `Timeout` field.
- Add timeout support for check execution.
- Add timeout support for check hook execution.
+- New gRPC inspired GraphQL implementation. See
+ [graphql/README](backend/apid/graphql/README.md) for usage.
## [2.0.0-alpha.13] - 2018-01-16
### Added
