I've released version 0.0.44 on github
https://github.com/jps-e/mobi-perl

The only coding changes are in mobils, so I have attached that here.

Version 0.0.44:

- Added automatic processing of azw and azw3 files in mobils when no
filename has been supplied.

- Added flag -d to mobils to enable debug prints.

- Added files License.txt and gpl-2.0.txt to reflect the change in
license from GPL3 or later to GPL2 or later in 0.0.41