Fix return type

Author: cjoudrey

app/models/graph/types/species.rb

@@ -50,7 +50,7 @@ module Types
       end
 
       field :language, types.String, "The language commonly spoken by this species."
-      field :homeworld, Planet, "A planet that this species originates from type." do
+      field :homeworld, Graph::Types::Planet, "A planet that this species originates from type." do
         resolve -> (species, _, _) do
           Graph::AssociationLoader.for(::Species, :homeworld).load(species)
         end