Add git hook support

[joshmedeski]

As a user, when I pull in the latest updates from the project, I want to be informed of what changes need to be made on my end, what new features exist, and any other important updates on the project, so I can be up-to-date.

• Setup githook to display a message when tpm updates the plugin
• Figure out how to attach specific messages to a commit being pulled in
• See https://git-scm.com/docs/githooks#_post_merge
• add to this