Rotate primary author

[mejincodes]

Is your feature request related to a problem? Please describe. When pairing/mobbing, it's nice to share credit—and blame 😆

Describe the solution you'd like Rotate (or randomize) who shows up as the primary author and who shows up as co-author(s) on commits

Describe alternatives you've considered A workaround in the meantime is to rerun the "git mit" command with the authors in a different order, but it would be nice to have the rotation built in