devel/py-pyscaffold: Add py-pyscaffold 4.2.1

PyScaffold is a project generator for bootstrapping high quality Python
packages, ready to be shared on PyPI and installable via pip. It is easy to use
and encourages the adoption of the best tools and practices of the Python
ecosystem, helping you and your team to stay sane, happy and productive. The
best part? It is stable and has been used by thousands of developers for over
half a decade!

WWW: https://github.com/pyscaffold/pyscaffold