code: func (s *ChangesService) ListVotes(changeID string, accountID string) (map[string]int, *Response, error) {
  	u := fmt.Sprintf("changes/%s/reviewers/%s/votes/", changeID, accountID)
  	req, err := s.client.NewRequest("GET", u, nil)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	var v map[string]int
  	resp, err := s.client.Do(req, &v)
  	if err != nil {
  		return nil, resp, err
  	}
  	return v, resp, err
  }
docs: // ListVotes lists the votes for a specific reviewer of the change.
  //
  // Gerrit API docs: https://gerrit-review.googlesource.com/Documentation/rest-api-changes.html#list-votes