* it seems to me that moving from the procedural setup.py
  to the declarative setup.cfg is a nice compromise between
  modernization and compatibility with legacy systems
* pkg_resources are dead, we should not use them, the suggested
  construct has as The Single Source of Truth™ version in
  git_deps/__init__.py and it should work anywhere with
  setuptools >= 46.4.0, which is reasonably ancient
* six should really never be mentioned any more