docs: function Formatter(format, timeFormat) {
  	format = format || '%(message)';
  	timeFormat = timeFormat || '%Y-%m-%d %H:%M:%S';
  
  	/**
  	 * @private
  	 * @type {string}
  	 */
  	this._format = format;
  
  	/**
  	 * @private
  	 * @type {string}
  	 */
  	this._timeFormat = timeFormat;
  }