Hello!

We have a project which uses GitPython to automate interacting with Git for GitOps based deployments. After the 3.1.30 release we started seeing an error in our integration tests:

failed on setup with "git.exc.GitCommandError: Cmd('git') failed due to: exit code(1)
  cmdline: git pull -v -- origen --rebase
  stderr: 'error: unknown option `rebase''"

We believe it was introduced with this PR.

The code that is failing is:

repository = _initialize_repository(working_directory, remote_repository_url, token)
repository.remotes['origen'].pull('--rebase')

Any help would be greatly appreciated!