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

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

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

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

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