After reading Hugo Comments with Staticman on Kostas Tsalikis' web site, I tried to leave the following comment.
As far as I know, Staticman can be used only with GitHub, since it works as a GitHub bot. Obviously, not all static sites are saved in GitHub, and this may be a showstopper for someone using another service. Thanks to eduardoboucas/staticman#219, Staticman now supports GitLab. You may view my demo Hugo site on Framagit at https://staticman-gitlab-pages.