tests against different Django versions

[codecov[bot]]

Codecov Report

Patch coverage: 4.76% and project coverage change: -1.17 :warning:

Comparison is base (afa414e) 79.68% compared to head (82829a5) 78.51%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #192 +/- ## ========================================== - Coverage 79.68% 78.51% -1.17% ========================================== Files 38 39 +1 Lines 1344 1364 +20 Branches 194 195 +1 ========================================== Hits 1071 1071 - Misses 273 293 +20 ``` | [Impacted Files](https://codecov.io/gh/jedie/django-reversion-compare/pull/192?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jens+Diemer) | Coverage Δ | | |---|---|---| | [...\_compare\_project/management/commands/update\_req.py](https://codecov.io/gh/jedie/django-reversion-compare/pull/192?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jens+Diemer#diff-cmV2ZXJzaW9uX2NvbXBhcmVfcHJvamVjdC9tYW5hZ2VtZW50L2NvbW1hbmRzL3VwZGF0ZV9yZXEucHk=) | `0.00% <0.00%> (ø)` | | | [manage.py](https://codecov.io/gh/jedie/django-reversion-compare/pull/192?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jens+Diemer#diff-bWFuYWdlLnB5) | `46.03% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jens+Diemer). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jens+Diemer)

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