client.trade().testNewOrder(parameters); not exists

please fix your readme. 

`client.trade().testNewOrder(parameters);` is not exists. it is not even in base interface of FuturesClient

```
public interface FuturesClient {
    Market market();

    Account account();

    UserData userData();

    PortfolioMargin portfolioMargin();
}
```

Could you please provide proper example of placing new order?