docs: def change_issue_milestone(self, issue_id, milestone):
          """
          Change the milestone of an issue.
          :param issue_id: the id of the issue
          :param milestone: the new milestone for the issue
              (set None to remove milestone)
          :return:
          """
          request_url = "{}issue/{}/milestone".format(self.create_basic_url(),
                                                      issue_id)
  
          payload = {} if milestone is None else {'milestone': milestone}
  
          return_value = self._call_api(request_url,
                                        method='POST', data=payload)
  
          LOG.debug(return_value)