unbanChatSenderChat(chatId, senderChatId, form = {}) {
    form.chat_id = chatId;
    form.sender_chat_id = senderChatId;
    return this._request('unbanChatSenderChat', { form });
  }
Use this method to unban a previously banned channel chat in a supergroup or channel.

The bot **must be an administrator** for this to work and must have the appropriate administrator rights.

@param {Number|String} chatId Unique identifier for the target chat or username of the target channel (in the format `@channelusername`)
@param {Number} senderChatId Unique identifier of the target user
@param {Object} [options] Additional Telegram query options
@return {Promise} True on success
@see https://core.telegram.org/bots/api#unbanchatsenderchat