Render commit messages as labels

[deuill]

Currently, commit messages are allowed via -m and stored, but not rendered in any way. Render these as labels after the branch/tag labels.

[fthomasfr]

Just for information, I have updated your script in my fork to render the commit labels: https://github.com/fthomasfr/grawkit/blob/roadmap/tests/explanation.svg

[deuill]

That looks awesome! I'll look to incorporate these changes in once I've got some time on my hands.