function report (_status = status) {
	status = _status
	const progress = Math.round((completed / added) * 100 * 100) / 100
	spinner.text = `${progress}% ${status}`
}
log the progress by updating the status message, percentage and spinner.
@param  {String} [_status] - optional (updated) status message. defaults to
the previous status message.
@see https://www.npmjs.org/package/ora