The desktop file is missing keywords

[fabiangreffrath]

The Debian package quality checker tool "lintian" complains about the desktop file missing a Keywords entry: https://lintian.debian.org/tags/desktop-entry-lacks-keywords-entry.html

I have added some Keywords to the desktop file which i proposed in #31 , so I suggest to add the following line to the current desktop file:

Keywords=jazz;jackrabbit;green;rabbit;bunny;jump;run;gun;platform;