add @OverRide annotation to java classpath verticle

Author: macedigital

src/main/java/com/mycompany/myproject/JavaHelloWorldVerticle.java

@@ -6,6 +6,7 @@
 
 public class JavaHelloWorldVerticle extends Verticle {
 
+    @Override
     public void start() {
         vertx.createHttpServer().requestHandler(new Handler<HttpServerRequest>() {
             public void handle(HttpServerRequest req) {