Fix FluxMessageChannel for the latest Reactor

spring-integration-core/src/main/java/org/springframework/integration/channel/FluxMessageChannel.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -82,7 +82,7 @@ public class FluxMessageChannel extends AbstractMessageChannel
 		ConnectableFlux<?> connectableFlux =
 				Flux.from(publisher)
 						.handle((message, sink) -> sink.next(send(message)))
-						.errorStrategyContinue()
+						.onErrorContinue()
 						.doOnComplete(() -> this.publishers.remove(publisher))
 						.publish();