simplify demo

apollo-demo/src/main/java/com/ctrip/framework/apollo/demo/spring/bean/AnnotatedBean.java

@@ -46,16 +46,10 @@ public class AnnotatedBean {
   @ApolloConfigChangeListener("application")
   private void someChangeHandler(ConfigChangeEvent changeEvent) {
     logger.info("[someChangeHandler]Changes for namespace {}", changeEvent.getNamespace());
-    for (String key : changeEvent.changedKeys()) {
-      ConfigChange change = changeEvent.getChange(key);
-      logger.info("[someChangeHandler]Change - key: {}, oldValue: {}, newValue: {}, changeType: {}",
-          change.getPropertyName(), change.getOldValue(), change.getNewValue(),
-          change.getChangeType());
-      if (key.equals("timeout")) {
+    if (changeEvent.isChanged("timeout")) {
       refreshTimeout();
     }
   }
-  }
 
   @ApolloConfigChangeListener({"application", "FX.apollo"})
   private void anotherChangeHandler(ConfigChangeEvent changeEvent) {