Merge pull request #6360 from jvanbaarsen/fix-6328-expose-username

Also expose username for the /discover endpoint

lib/api/entities.rb

@@ -15,7 +15,7 @@ module API
     end
 
     class UserSafe < Grape::Entity
-      expose :name
+      expose :name, :username
     end
 
     class UserBasic < Grape::Entity