Multiple subscription at once, Instument null issue

[kayahasa]

        var result = await client.SubscribeToCandlesticksAsync(update =>
        {
            if (update == null)
            {
                return;
            }
            _futuresCandleService.UpdateSymbol(**update.Instrument**, MapToKlineData(update, interval));
            _priceTickerService.UpdateSymbol(**update.Instrument**, update.Close);

        }, symbolList, interval);

        It is good to see multiple subscription at once method support with new release. However,
        in this code, **update.Instrument** is null. 
        Instrument should be set.

[kayahasa]

Most probably it is coming as InstrumentId but on the update model it is Instrument.

So mapping fails.

[kayahasa]

Sir,

I have created pull request.

Thanks

[burakoner]

Thank you very much for your feedback and pull request. I've merged your request and will release new version in a few hours