From: Jim Ma <mail2jimma_at_gmail.com>
Date: Tue, 9 May 2017 11:59:47 +0800

Hi,
The new added RxInvokerProvider must be registered to the client using
Client.register(Class) before create another reactive implementation
invoker. Why do we need register to client first? Is it good that we simply
change the Invocation.Builde#rx to
   public <T extends RxInvoker> T rx(RxInvokerProvider<T> provider)
   {
      return provider.getRxInvoker(this, executorService);
   }
without register ?

Thanks,
Jim