code: func (s *ActivityService) GetThread(ctx context.Context, id string) (*Notification, *Response, error) {
  	u := fmt.Sprintf("notifications/threads/%v", id)
  
  	req, err := s.client.NewRequest("GET", u, nil)
  	if err != nil {
  		return nil, nil, err
  	}
  
  	notification := new(Notification)
  	resp, err := s.client.Do(ctx, req, notification)
  	if err != nil {
  		return nil, resp, err
  	}
  
  	return notification, resp, nil
  }
docs: // GetThread gets the specified notification thread.
  //
  // GitHub API docs: https://developer.github.com/v3/activity/notifications/#view-a-single-thread