Problems while searching for a new upstream version

package:
golang-github-nightlyone-lockfile
severity:
high
created:
2017-11-21
last updated:
2019-05-19

uscan had problems while searching for a new upstream version:
In debian/watch no matching files for watch line
  https://github.com/nightlyone/lockfile/tags .*/v?(\d\S*)\.tar\.gz