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: Lennart Weller <email@example.com>
Date: Mon Feb 11 10:29:21 2019 +0100
Choose xen-hypervisor package instead of non-existing xen