public async void HistoHourOnline()
        {
            var cc = new CryptoCompare(new Maybe <IDownloadData>());

            var res = await cc.HistoHour("ETH", "BTC", emptyStringMaybe, emptyIntMaybe,
                                         emptyIntMaybe,
                                         emptyIntMaybe);

            Assert.Equal("Success", res.Response);
            Assert.NotEmpty(res.Data);
        }
        public async void HistoHourWithParametersOnline()
        {
            var cc = new CryptoCompare(new Maybe <IDownloadData>());

            var res = await cc.HistoHour(
                "ETH",
                "BTC",
                new Maybe <string>("Kraken"),
                new Maybe <int>(2),
                new Maybe <int>(10),
                emptyIntMaybe);

            Assert.Equal("Success", res.Response);
            Assert.NotEmpty(res.Data);
            Assert.True(res.Aggregated);
        }