deleteStickerFromSet method
Use this method to delete a sticker from a set created by the bot
Returns True on success.
Implementation
Future<bool> deleteStickerFromSet(String sticker) async {
var requestUrl = _apiUri('deleteStickerFromSet');
var body = <String, dynamic>{'sticker': sticker};
return await HttpClient.httpPost(requestUrl, body: body);
}