v0.18

• Use Django 3.2 as the minimum version
  • In setup.py, set 'django>=3.2'
  • In setup.py, remove 'django-admin-display'
  • In Django Admin files, change use of @admin_display to the new built-in decorators, updating argument names too
  • In tox.ini, add the line ignore:.*default_app_config*.:django.utils.deprecation.RemovedInDjango41Warning to filterwarnings
• Switch CI to GitHub Actions
  • Delete .circleci/config.yml
  • Add the file .github/workflows/ci.yml from here
• Remove unnecessary warning filters
  • In tox.ini, remove the line ignore::django.utils.deprecation.RemovedInDjango40Warning:oauth2_provider
  • In tox.ini, remove the line ignore:.*DEFAULT_HASHING_ALGORITHM.*:django.utils.deprecation.RemovedInDjango40Warning:django and the comment above