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.

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

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

BREAKING CHANGE: invoking kosmorro command without --latitude and
--longitude arguments will now only output the Moon phase and,
eventually, the events for the given date (or today if date not given).

BREAKING CHANGE: JSON format now returns the moon phase as an object
instead of a string