* chore: install conventional-changelog locally when releasing

* build: bumb v0.10.12

---------

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

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

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.