* chore: install conventional-changelog locally when releasing

* build: bumb v0.10.12

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Co-authored-by: Jérôme Deuchnord <jerome@deuchnord.fr>

BREAKING CHANGE: AppImage is no longer available. This decision has been
made because it has become hard to maintain lately, and I don't have
time nor motivation to fix it.

BREAKING CHANGE: Docker support has been removed.
If you were using it, please migrate to [one of the other available options](https://kosmorro.space/cli/download/).

BREAKING CHANGE: on Ubuntu 20.04+, the `texlive-latex-extra` package is needed to generate the PDF output

BREAKING CHANGE: some methodes in Event and MoonPhase have been dropped
in favor of `enum.Enum`'s `name` and `value` properties.