Use git repo data (latest tag, current commit hash, etc) for building a version
number according to PEP 440.

Features:
* Can be installed & configured through both setup.py and PEP 518's
  pyproject.toml
* Does not require to change source code of the project
* Tag-, file-, and callback-based versioning schemas are supported
* Templates for tag, dev and dirty versions are separated
* Templates support a lot of substitutions including git and environment
  information
* Well-documented

Homepage:
https://setuptools-git-versioning.readthedocs.io/
