* merge master into v3
* fix order_by snake casing by checking if value is None, switch executor to execution_context_class since schema.execute no longer supports executor
* fix linting by removing duplicate defintion and test of convert_form_field_to_string_list
* Documentation missing endpoint explanation
Add some information about GRAPHQL_URL. Otherwise people run into ERROR 400 problems, if they have a different endpoint.
* Update docs/testing.rst
Co-Authored-By: Jonathan Kim <jkimbo@gmail.com>
Co-authored-by: Jonathan Kim <jkimbo@gmail.com>