* Migrate tests from nose to unittest and pytest
* Replace :mod:`pytz` dependency with
:attr:`datetime.timezone.utc` and :mod:`zoneinfo`
* Reformat codebase with black and isort
* Configure GitHub Actions; remove Travis CI configuration file
- drop switch-to-pytest.patch (upstream)
* Use assert and pytest rather than nose.
- Update to version 1.0
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-pyRFC3339?expand=0&rev=12