getChatAdministrators(chatId, form = {}) {
    form.chat_id = chatId;
    return this._request('getChatAdministrators', { form });
  }
Use this method to get a list of administrators in a chat

@param {Number|String} chatId  Unique identifier for the target group or username of the target supergroup
@param {Object} [options] Additional Telegram query options
@return {Promise} On success, returns an Array of [ChatMember](https://core.telegram.org/bots/api#chatmember) objects that contains information about all chat administrators except other bots.
If the chat is a group or a supergroup and no administrators were appointed, only the creator will be returned
@see https://core.telegram.org/bots/api#getchatadministrators