def METHOD_NAME(self):
    """Gets difference between current branch and origin/master
    git diff with the --unified=100 option means that if there exists a
    difference between origin/master and current branch, the output will have at most 100
    lines of context.
    Returns:
        str. empty string if no changes made or no origin/master branch, otherwise full difference context.
    """
    return run_command(
        f"git diff --unified=100 " f"origin/master {self.release_notes_path}"
    )