add missing helper

Author: vandonr

dd-java-agent/instrumentation/vertx/vertx-web/vertx-web-3.4/src/main/java/datadog/trace/instrumentation/vertx_3_4/server/HttpServerResponseEndHandlerInstrumentation.java

@@ -20,6 +20,7 @@ public HttpServerResponseEndHandlerInstrumentation() {
   public String[] helperClassNames() {
     return new String[] {
       packageName + ".EndHandlerWrapper",
+      packageName + ".RouteUpdateHelper",
       packageName + ".RouteHandlerWrapper",
       packageName + ".VertxDecorator",
       packageName + ".VertxDecorator$VertxURIDataAdapter",

dd-java-agent/instrumentation/vertx/vertx-web/vertx-web-4.0/src/main/java/datadog/trace/instrumentation/vertx_4_0/server/HttpServerResponseEndHandlerInstrumentation.java

@@ -26,6 +26,7 @@ public Reference[] additionalMuzzleReferences() {
   public String[] helperClassNames() {
     return new String[] {
       packageName + ".EndHandlerWrapper",
+      packageName + ".RouteUpdateHelper",
       packageName + ".RouteHandlerWrapper",
       packageName + ".VertxDecorator",
     };