Como alterar o repositório-mestre do github

git mudar a origem

$ git remote -v
> origin  https://github.com/USERNAME/REPOSITORY.git (fetch)
> origin  https://github.com/USERNAME/REPOSITORY.git (push)

Change your remote\'s URL from HTTPS to SSH with the git remote set-url command.
$ git remote set-url origin [email protected]:USERNAME/REPOSITORY.git

Verify that the remote URL has changed.
$ git remote -v
# Verify new remote URL
> origin  [email protected]:USERNAME/REPOSITORY.git (fetch)
> origin  [email protected]:USERNAME/REPOSITORY.git (push)