code: func (s *IssuesService) EditLabel(ctx context.Context, owner string, repo string, name string, label *Label) (*Label, *Response, error) {
  	u := fmt.Sprintf("repos/%v/%v/labels/%v", owner, repo, name)
  	req, err := s.client.NewRequest("PATCH", u, label)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	// TODO: remove custom Accept header when this API fully launches.
  	req.Header.Set("Accept", mediaTypeLabelDescriptionSearchPreview)
  
  	l := new(Label)
  	resp, err := s.client.Do(ctx, req, l)
  	if err != nil {
  		return nil, resp, err
  	}
  
  	return l, resp, nil
  }
docs: // EditLabel edits a label.
  //
  // GitHub API docs: https://developer.github.com/v3/issues/labels/#update-a-label