feat (FEDERATION) #911: Adjust changelog for new feature

Author: renepardon

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
+- Add federation support for GraphQL
 - Add `syncWithoutDetaching` option for BelongsToMany and MorphToMany relationships https://github.com/nuwave/lighthouse/pull/1031
 - Add `injectArgs` option to `@can` directive to pass along client defined
   arguments to the policy check https://github.com/nuwave/lighthouse/pull/1043