Updated package infrastructure#24

Merged

saimn merged 8 commits intomasterfrom

infrastructure-updates

Oct 27, 2020

Commits on Oct 17, 2020

Updated package infrastructure - including using setup.cfg, setting up tox, using pyproject.toml, using setuptools_scm, and updating the Travis configuration.
astrofrog
committed
Remove AppVeyor configuration
astrofrog
committed

Commits on Oct 18, 2020

Commits on Oct 27, 2020