New features
* Extract query function from GraphQLTestCase making it possible to use in a pytest fixture (1015)
* Add headers support to GraphiQL (1016)
* Add converter for Django 3.1 JSONField (1017)
Bugfixes
* Fix Connection/Edge naming and add unit test (1012)
Huge thanks to tcleonard, radekwlsk and nikolaik for helping!
Full changelog: https://github.com/graphql-python/graphene-django/compare/v2.12.1...v2.13.0