android: Use ReactModule annotation from 0.58

As react-native 0.58, native modules now need the ReactModule
Java annotation.

PR-URL: #9
Refs: https://github.com/react-native-community/react-native-releases/blob/72dde0d270685f44d2f827544267502dcb0b6235/CHANGELOG.md#058
Reviewed-By: Jaime Bernardo <jaime@janeasystems.com>

android/src/main/java/com/janeasystems/rn_nodejs_mobile/RNNodeJsMobileModule.java

@@ -5,6 +5,7 @@
 import com.facebook.react.bridge.ReactContextBaseJavaModule;
 import com.facebook.react.bridge.ReactMethod;
 import com.facebook.react.modules.core.RCTNativeAppEventEmitter;
+import com.facebook.react.module.annotations.ReactModule;
 import com.facebook.react.bridge.WritableMap;
 import com.facebook.react.bridge.ReadableMap;
 import com.facebook.react.bridge.ReadableType;
@@ -25,6 +26,7 @@
 import java.util.*;
 import java.util.concurrent.Semaphore;
 
+@ReactModule(name = "RNNodeJsMobile")
 public class RNNodeJsMobileModule extends ReactContextBaseJavaModule implements LifecycleEventListener {
 
   private final ReactApplicationContext reactContext;