Version 2.10.0

• Fix usage of unittest to be ready for Python 3.11 (#288).
• Fix default_app_config deprecation warning for Django 3.2 (#289).
• Replace Travis with GitHub Actions, dropping ppc64le arch tests (#290).
  • Added Python 3.10 to tests (Django supports it if >=3.2.9).
• Run pyupgrade, remove compatibility code (#291).
• Add support for Django 4.0, with more old-code cleanup (#292).
  • Remove use of django.conf.urls.url in test app (gone in Django 4.0).
  • Set DEFAULT_AUTO_FIELD to avoid warnings in test app.
  • Remove django_jinja.contrib._pipeline package, which was deprecated in 2015.
  • Drop formal Django 3.0 and 3.1 support.
    • Projects using these versions should still function until support for 2.2 is dropped.
• Django 2.2 and Python 3.6 will likely be dropped in the next non-patch release.