this package seems to have new commits in its VCS but has
not yet updated debian/changelog. You should consider updating
the Debian changelog and uploading this new version into the archive.
Here are the relevant commit logs:
Author: Mike Gabriel <email@example.com>
Date: Thu Dec 6 21:47:00 2018 +0100
debian/debian-edu-artwork-spacefun.triggers: Don't get triggered on installations of the newer Debian Edu themes.