깃에서 사용자정보 변경하기
check username and email
git config user.name; git config user.email;
change username
git config user.name <New name>;
change user email
git config user.email <New email>;
check username and email
git config user.name; git config user.email;
change username
git config user.name <New name>;
change user email
git config user.email <New email>;