code: func (s *GistsService) Get(ctx context.Context, id string) (*Gist, *Response, error) {
  	u := fmt.Sprintf("gists/%v", id)
  	req, err := s.client.NewRequest("GET", u, nil)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	gist := new(Gist)
  	resp, err := s.client.Do(ctx, req, gist)
  	if err != nil {
  		return nil, resp, err
  	}
  
  	return gist, resp, nil
  }
docs: // Get a single gist.
  //
  // GitHub API docs: https://developer.github.com/v3/gists/#get-a-single-gist