[RFC] Automatize release with CircleCI

[Bladrak]

As of today, releasing the library to Pypi is a manual step performed by me. It would be better to automatize this process using CircleCI.

The process I'm suggesting is:

• Create a release on GitHub
• With the release is associated a tag, which runs a pipeline on CircleCI
• This pipeline pushes to Pypi a version matching the tag name

If that's ok with everyone (or if I don't get an objection within 2 weeks), I'll try to work on that :)