example add subtitle

Author: KenChoi1992

example/main/java/cn/jpush/api/examples/PushExample.java

@@ -223,7 +223,7 @@ public static void testSendIosAlert() {
         JPushClient jpushClient = new JPushClient(masterSecret, appKey);
 
         IosAlert alert = IosAlert.newBuilder()
-                .setTitleAndBody("test alert", "test ios alert json")
+                .setTitleAndBody("test alert", "subtitle", "test ios alert json")
                 .setActionLocKey("PLAY")
                 .build();
         try {