code: func (s *GistsService) ListAll(ctx context.Context, opt *GistListOptions) ([]*Gist, *Response, error) {
  	u, err := addOptions("gists/public", opt)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	req, err := s.client.NewRequest("GET", u, nil)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	var gists []*Gist
  	resp, err := s.client.Do(ctx, req, &gists)
  	if err != nil {
  		return nil, resp, err
  	}
  
  	return gists, resp, nil
  }
docs: // ListAll lists all public gists.
  //
  // GitHub API docs: https://developer.github.com/v3/gists/#list-gists