* Update python classifier in setup.cfg
* Remove six usage
* Drop python3.6/3.7 support in testing runtime
* Update CI to use unversioned jobs template
* Use py3 as the default runtime for tox
* Move flake8 as a pre-commit local target
* Migrate from testr to stestr
* Use TOX\_CONSTRAINTS\_FILE
* Adding pre-commit
- Add missing BuildRequires on six.
- replace oslotest with more correct fixtures dependency
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-sphinx-feature-classification?expand=0&rev=23