public override Task <T> ReadData()
        {
            Configuration configManager = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            KeyValueConfigurationCollection confCollection = configManager.AppSettings.Settings;
            string app_id  = confCollection["app_id"].Value;
            string package = confCollection["latestJson"].Value;
            string baseURL = confCollection["openExchangeBasicUrl"].Value;
            string url     = string.Format("{0}{1}?app_id={2}", baseURL, package, app_id);

            Task <T> result = HttpRequester.GetData <T>(url);

            return(result);
        }