getChatMenuButton(form = {}) {
    return this._request('getChatMenuButton', { form });
  }
Use this method to get the current value of the bot's menu button in a private chat, or the default menu button.

@param {Object} [options] Additional Telegram query options
@return {Promise} [MenuButton](https://core.telegram.org/bots/api#menubutton) on success
@see https://core.telegram.org/bots/api#getchatmenubutton