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: Hideki Yamane <firstname.lastname@example.org>
Date: Wed Jun 3 21:15:06 2020 +0900
Use dh-sequence-python3 and simplify debian/rules