* chore(deps-dev): bump black from 21.6b0 to 21.7b0

Bumps [black](https://github.com/psf/black) from 21.6b0 to 21.7b0.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](https://github.com/psf/black/commits)

---
updated-dependencies:
- dependency-name: black
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

* ci: update Black version

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Jérôme Deuchnord <jerome@deuchnord.fr>

Co-authored-by: Damgermys <damhub28@gmail.com>

Co-authored-by: Damgermys <damhub28@gmail.com>

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.

Show a graph instead of a table for the ephemerides in the PDF output

BREAKING CHANGE: the JSON format has deeply changed to enhance its
consistency

The observer's position and timezone can now be set using the following
environment variables:

- `KOSMORRO_LATITUDE`: the observer's latitude
- `KOSMORRO_LONGITUDE`: the observer's longitude
- `KOSMORRO_TIMEZONE`: the observer's timezone

BREAKING CHANGE: the --day, --month and --year arguments have been removed in the
favor of a single one.

You can now use the `--format=pdf` argument to save the data computed by
Kosmorro to a PDF file. The new `--output` argument must be given with
the export file path.

Colors can be disabled with the new `--no-colors` argument.