githooks

Need to come up with a better way to get a rebase commit log than what we do now:
https://github.com/jevakallio/git-notify/blob/master/src/git.ts#L28

For the time being as a workaround, you can skip installing the post-rewrite hook altogether -- the use case for this is pretty niche, in most people's workflows they'll end up pulling the commits to a local branch before rebasing on top of their

Add a sample pbit for testing the scripts easily.

• Build status/stable version?
• license?
• dependencies (up to date)
• dev-dependencies (up to date)
• documentation link
  • https://github.com/Naereen/badges#read-the-docs-status
  • esdoc badge
• npm version?
• node version?
• tests passing? https://help.github.com/en/actions/configuring-and-managing-workflows/configuring-a-work