Log Message:
py-test-django: updated to 3.9.0

v3.9.0:

Improvements
* Improve test ordering with Django test classes
* Remove import of pkg_resources for parsing pytest version (performance)

Bugfixes
* Work around unittest issue with pytest 5.4.{0,1}
* Don't break --failed-first when re-ordering tests
* pytest_addoption: use `group.addoption`

Misc
* Remove Django version from --nomigrations heading
* docs: changelog: prefix headers with v for permalink anchors
* changelog: add custom/fixed anchor for last version
* setup.py: add Changelog to project_urls