Autotag using CalVer to update DOI at Zenodo

[Hugo van Kemenade]

https://doi.org/10.5281/zenodo.3719394
https://calver.org/

Is a tag enough or does it need a GitHub release?

Looks like a release is needed: zenodo/zenodo#40

There should be a GitHub Action that can automatically create a release when a tag is created.

[Hugo van Kemenade]

Added in #11 and #12, let's see how it goes on 2020-04-01.

[Hugo van Kemenade]

🚀 It worked! 🎉

https://github.com/hugovk/top-pypi-packages/releases/tag/2020.04
https://zenodo.org/record/3736500#.XoSmu9P7QWo