Release hg-git 0.9.0

Because of the fixes to make hg-git run on Python 3 and recent Mercurial versions, we should soon make a release.

General thoughts about the release procedure we can discuss in subsequent issues

It is probably a good idea to do releases more frequently, at least such that the latest released hg-git version always works with the latest released Mercurial version. This would solve issues like #307 (closed).

Do we need to have stabilization period before doing a release?

Edited May 11, 2020 by Manuel Jacob

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