Fix author on github

git rebase -i COMMIT^ # NB: trailing caret
# s/pick/edit/ for desired commit
# save/exit
git commit --amend --reset-author --no-edit
# sets the commit to you (hope you did git config user.{name,email})
# alternatively to specify the user at-once
# git commit --amend --author "username <username@fraubsd.org>" --no-edit
git rebase --continue
git push --force --all # NB: Hope your clone is full-depth