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: Nobuhiro Iwamatsu <email@example.com>
Date: Mon Dec 31 21:34:18 2018 +0900
Signed-off-by: Nobuhiro Iwamatsu <firstname.lastname@example.org>