sendAction(action, options) {
    return this.bot.sendAction(this.userId, action, options);
  }
Send an action.
To send a typing indicator in a more convenient way, see the .sendTypingIndicator method.
@param {String} action One of 'mark_seen', 'typing_on' or 'typing_off'
@param {SendMessageOptions} [options] NOT USED.