이전 커밋으로 되돌리기
git reset 커밋번호되돌린 후 강제 push
! [rejected] master -> master (non-fast-forward)
error: failed to push some refs to 'git@~~~~.git
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Integrate the remote changes (e.g.
hint: 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.
git push -f origin master