Add to repo/project managers

[jayvdb]

pbr does the same as fastentrypoints.

We could get other setup.py manager tools to adopt fastentrypoints.

• @dephell
• hatch
• @pyscaffold
• @hitchdev
• @cookiecutter
• pew
• @pybuilder
• apg
• https://pypi.org/project/setup-py-upgrade/
• https://github.com/nerdvegas/rez
  etc