printStats (message, logTimeLeft) {
    message = `${message}; ${this.trackerName} progress: ${this.getPercentage()}% done`
    if (logTimeLeft) {
      message = `${message} - ${this.getTimeLeft()} left`
    }
    console.log(message)
  }
Print the current progress.
@param  {string}    A short message about the current task progress
@param  {[boolean]} logTimeLeft whether or not to log the time left.