Merge branch 'support-monogengine-field-enum' into support-graphene-v3

Author: arunsureshkumar

graphene_mongo/converter.py

@@ -429,7 +429,7 @@ def dynamic_type():
     return graphene.Dynamic(dynamic_type)
 
 
-if sys.version_info > (3, 5):
+if sys.version_info >= (3, 6):
     @convert_mongoengine_field.register(mongoengine.EnumField)
     def convert_field_to_enum(field, registry=None):
         if not registry.check_enum_already_exist(field._enum_cls):