Update Query to inherit from graphene.ObjectType. (#68)

README.md

@@ -40,7 +40,7 @@ class IngredientType(DjangoObjectType):
         model = Ingredient
 
 
-class Query(object):
+class Query(graphene.ObjectType):
     all_categories = graphene.List(CategoryType)
     all_ingredients = graphene.List(IngredientType)
 
@@ -206,4 +206,4 @@ class Query(object):
 
     def resolve_all_ingredients(root, info):
         return gql_optimizer.query(Ingredient.objects.all(), info, disable_abort_only=True)
-```
\ No newline at end of file
+```