Unprotect the branch.

        Args:
            **kwargs: Extra options to send to the server (e.g. sudo)

        Raises:
            GitlabAuthenticationError: If authentication is not correct
            GitlabProtectError: If the branch could not be unprotected

def unprotect(self, **kwargs):
        """Unprotect the branch.

        Args:
            **kwargs: Extra options to send to the server (e.g. sudo)

        Raises:
            GitlabAuthenticationError: If authentication is not correct
            GitlabProtectError: If the branch could not be unprotected
        """
        id = self.get_id().replace('/', '%2F')
        path = '%s/%s/unprotect' % (self.manager.path, id)
        self.manager.gitlab.http_put(path, **kwargs)
        self._attrs['protected'] = False