Fix event warning

android/src/main/java/cn/reactnative/modules/update/UpdateModule.java

@@ -280,6 +280,15 @@ public class UpdateModule extends ReactContextBaseJavaModule {
         promise.resolve(updateContext.getKv("hash_" + hash));
     }
 
+    @ReactMethod
+    public void addListener(String eventName) {
+    // Set up any upstream listeners or background tasks as necessary
+    }
+
+    @ReactMethod
+    public void removeListeners(Integer count) {
+    // Remove upstream listeners, stop unnecessary background tasks
+    }
     
     /* 发送事件*/
     public static void sendEvent(String eventName, WritableMap params) {