code: def unapprove(self, **kwargs):
          
          path = '%s/%s/unapprove' % (self.manager.path, self.get_id())
          data = {}
  
          server_data = self.manager.gitlab.http_post(path, post_data=data,
                                                      **kwargs)
          self._update_attrs(server_data)
docs: Unapprove the merge request.
  
          Args:
              **kwargs: Extra options to send to the server (e.g. sudo)
  
          Raises:
              GitlabAuthenticationError: If authentication is not correct
              GitlabMRApprovalError: If the unapproval failed