Log Message:
py-setuptools_scm: update to 2.0.0.

v2.0.0
========

* fix #237 - correct imports in code examples
* improve mercurial commit detection (thanks Aaron)
* breaking change: remove support for setuptools before parsed versions
* reintroduce manifest as the travis deploy cant use the file finder
* reconfigure flake8 for future compatibility with black
* introduce support for branch name in version metadata and support a opt-in \ 
simplified semver version scheme