deleteStickerFromSet(sticker, form = {}) {
    form.sticker = sticker;
    return this._request('deleteStickerFromSet', { form });
  }
Use this method to delete a sticker from a set created by the bot.

@param {String} sticker File identifier of the sticker
@param {Object} [options] Additional Telegram query options
@return {Promise} True on success
@see https://core.telegram.org/bots/api#deletestickerfromset
@todo Add tests for this method!