Problems while searching for a new upstream version

package:
sslh
severity:
high
created:
2017-11-21
last updated:
2019-05-22

uscan had problems while searching for a new upstream version:
In debian/watch no matching files for watch line
  http://www.rutschle.net/tech/sslh.shtml (?:|.*/)sslh(?:[_\-]v?|)(\d\S*)\.(?:tar\.xz|txz|tar\.bz2|tbz2|tar\.gz|tgz)