Automate the release process

[Youw]

Kind-of related to #315.

Right now there is a set of manual steps that needs to be done for each release. As a human, the person who performs those steps can make a mistake and f**k-up the release (Presisely what I did when tried to release a 0.11.1 - forgot to update the version file. That's why we have 0.11.2 right after 0.11.0).

That process better be fully automated (except the release NOTES - those better be filled up manually).

I don't have a final idea how to do so, but it better be done rather sooner than later.

[Youw]

One step closer: #414 - Windows build artifact (as used with each release) is now created with Github actions.