You need to go revert all of those commits ASAP. EDIT: also if there are any forks of your project, you should ask people who forked it to restore the original

You need to go revert all of those commits ASAP. EDIT: also if there are any forks of your project, you should ask people who forked it to restore the original copyright notice as well. If the original copyright holder sees your name instead of theirs, they'll know who to sue.