Fix #27 Data too long for column 'desc'

Before this PR the CI steps doesn't run only one combination.

e.g.: https://github.com/boxine/django-huey-monitor/runs/2711496007

Now all Github CI action steps runs on one Python/Django version combination.

Another problem: Call `tox` local will not use different Python versions!

* Remove test against Django 3.0 and add tests with Django 3.2
* Run tests also on MacOS
* Add a `pytest-ci.ini` that will only used on github CI
* Omit `.*` in coverage

Modernize github CI pipeline and bugfix local `tox` call

Prepare v0.4.1 release