code: func (img Images) GetBest() string {
  	best := ""
  	var mh, mw int
  	for _, v := range img.Versions {
  		if v.Width > mw || v.Height > mh {
  			best = v.URL
  			mh, mw = v.Height, v.Width
  		}
  	}
  	return best
  }
docs: // GetBest returns the URL of the image with the best quality.