https://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.htmlhttps://github.com/torvalds/subsurface-for-dirk/blob/master/README.md#contributinghttp://who-t.blogspot.com/2009/12/on-commit-messages.htmlhttps://wiki.openstack.org/wiki/GitCommitMessages