code: function logChat(from, message) {
    if (typeof config.log !== 'string' || !from || typeof message !== 'string')
      return;
  
    // Get the current moment
    var now = moment();
  
    // Create the file name
    var file = path.join(config.log, now.format('YYYY-MM-DD') + '-' + 'chat.log');
  
    // Create the text to log based on moment and chat info
    var text = '[' + now.format('YYYY-MM-DD hh:mm A') + '] ' + from + ': ' + message + '\n';
  
    // Append the text to the log file
    fs.appendFile(file, text, function(err) {
      if (err)
        error(err);
    });
  }
docs: Log message to chat logs
  
  @param from    {string} - name of person sending the message
  @param message {string} - the message sent