Set auto commit (#914)

example/src/main/java/org/apache/rocketmq/example/ordermessage/Consumer.java

@@ -40,7 +40,7 @@ public class Consumer {
 
             @Override
             public ConsumeOrderlyStatus consumeMessage(List<MessageExt> msgs, ConsumeOrderlyContext context) {
-                context.setAutoCommit(false);
+                context.setAutoCommit(true);
                 System.out.printf("%s Receive New Messages: %s %n", Thread.currentThread().getName(), msgs);
                 this.consumeTimes.incrementAndGet();
                 if ((this.consumeTimes.get() % 2) == 0) {