code: func (ui *PrefixUI) Warn(message string) {
  	if ui.WarnPrefix == " " { //Lets keep the space if they want one
  		message = ui.WarnPrefix + message
  	} else if ui.WarnPrefix != "" {
  		message = ui.WarnPrefix + " " + message
  	}
  	ui.UI.Warn(message)
  }
docs: // Warn calls UI.Warn to write.
  // Useful when you want separate colors or prefixes.
  // WarnPrefix is used to prefix message.