code: func (c CookbookListResult) String() (out string) {
  	for k, v := range c {
  		out += fmt.Sprintf("%s => %s\n", k, v.Url)
  		for _, i := range v.Versions {
  			out += fmt.Sprintf(" * %s\n", i.Version)
  		}
  	}
  	return out
  }
docs: // String makes CookbookListResult implement the string result