Merge pull request #47 from intercom/santhosh/update_readme

Update README.md

Author: SanthoshKumarSrikanthaMurali

README.md

@@ -177,6 +177,12 @@ import com.intercom.reactnative.IntercomModule;
 
 public class MainNotificationService extends FirebaseMessagingService {
 
+  @Override
+  public void onNewToken(String refreshedToken) {
+    IntercomModule.sendTokenToIntercom(getApplication(), refreshedToken);
+    //DO LOGIC HERE
+  }
+
   public void onMessageReceived(RemoteMessage remoteMessage) {
     if (IntercomModule.isIntercomPush(remoteMessage)) {
       IntercomModule.handleRemotePushMessage(getApplication(), remoteMessage);