code: func (subs Subtitles) Best() *Subtitle {
  	if len(subs) > 0 {
  		sort.Sort(ByDownloads(subs))
  		return &subs[0]
  	}
  	return nil
  }
docs: // Best finds the best subsitle in a Subtitles collection. Of course
  // "best" is hardly an absolute concept: here, we just take the most
  // downloaded file.