sendGift(giftId, form = {}) {
    form.gift_id = giftId;
    return this._request('sendGift', { form });
  }
Use this method to sends a gift to the given user or channel chat.

@param {String} giftId Unique identifier of the gift
@param {Object} [options] Additional Telegram query options.
@return {Promise} On success, returns true.
@see https://core.telegram.org/bots/api#getavailablegifts