guess output format based on output file extension
check for empty output file
default to .txt if no file extension provided
change default output format back to txt
add tests
update man page
fix default output format
directly return output dumper
use keys from dumpers in key error message
fix man pages
prevent output format from being overridden
use first dumper key as default format
update messages and formatting
update help message for format argument
specify list type in InvalidOutputFormat exception
make default output format more apparent
update messages
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.
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).
Nic
Jérôme Deuchnord
