public async void UpdateMessage(string chatId, int messageId, string text, string parse_mode = "html")
        {
            var body = new UpdateMessageBody()
            {
                chat_id = chatId, message_id = messageId, text = text, parse_mode = parse_mode
            };

            var url = "https://api.telegram.org/bot" + _settings.botToken + "/editMessageText";

            var json = JsonConvert.SerializeObject(body);

            var content = new StringContent(json, Encoding.UTF8, "application/json");

            var res = await _client.PostAsync(url, content);
        }
        public async void LeaveChat(string chatId)
        {
            var body = new UpdateMessageBody()
            {
                chat_id = chatId
            };

            var url = "https://api.telegram.org/bot" + _settings.botToken + "/leaveChat";

            var json = JsonConvert.SerializeObject(body);

            var content = new StringContent(json, Encoding.UTF8, "application/json");

            var res = await _client.PostAsync(url, content);
        }