BinanceAccountService assumes futures account when not using sandbox

[tdiesler]

BinanceAccountService:97

      if(exchange.usingSandbox()){
        ...
      } else {
        BinanceFutureAccountInformation futureAccountInformation = futuresAccount();
        ...
      }

[enrand22]

This was fixed here: https://github.com/knowm/XChange/commit/021e4fb7894ff442f3d479938fe3ec1542510439

And is in develop branch.