Update types.py

Author: schattian

graphene_mongo/types.py

@@ -37,7 +37,7 @@ def construct_fields(model, registry, only_fields, exclude_fields):
         if isinstance(field, mongoengine.ListField):
             if not field.field:
                 continue
-             # Take care of list of self-reference.
+            # Take care of list of self-reference.
             document_type_obj = field.field.__dict__.get('document_type_obj', None)
             if document_type_obj == model._class_name \
                     or isinstance(document_type_obj, model) \