fix dc example by adding the event handler for the CustomerMarkedVip …

…event

samples/replicated/shopping-cart-service-java/src/main/java/shopping/cart/ShoppingCart.java

@@ -525,6 +525,7 @@ public EventHandler<State, Event> eventHandler() {
         .forAnyState()
         .onEvent(
             ItemUpdated.class, (state, event) -> state.updateItem(event.itemId, event.quantity))
+        .onEvent(CustomerMarkedVip.class, (state, event) -> state.markCustomerVip())
         .onEvent(
             Closed.class,
             (state, event) -> {