getChat(chatId, form = {}) {
    form.chat_id = chatId;
    return this._request('getChat', { form });
  }
Use this method to get up to date information about the chat
(current name of the user for one-on-one conversations, current
username of a user, group or channel, etc.).
@param {Number|String} chatId Unique identifier for the target chat or username of the target channel (in the format `@channelusername`) or channel
@param {Object} [options] Additional Telegram query options
@return {Promise} [ChatFullInfo](https://core.telegram.org/bots/api#chatfullinfo) object on success
@see https://core.telegram.org/bots/api#getchat