Fix NodeJS benchmark

Former-commit-id: a1d87cf3a3f4790b9e392dc3c100180284286797

_benchmarks/expressjs/app.js

@@ -1,6 +1,13 @@
 process.env.NODE_ENV = 'production';
 
 const express      = require('express');
+const createWorker = require('throng')
+
+
+createWorker(createWebServer)
+
+function createWebServer()
+{
   const app = express();
 
   app.get('/api/values/:id', function (req, res) {
@@ -12,3 +19,5 @@ app.listen(5000, function () {
       'Now listening on: http://localhost:5000\nApplication started. Press CTRL+C to shut down.'
     )
   });
+  
+}

_benchmarks/expressjs/package.json

@@ -9,6 +9,7 @@
   "author": "Gerasimos (Makis) Maropoulos <kataras2006@hotmail.com>",
   "license": "ISC",
   "dependencies": {
-    "express": "^4.16.0"
+    "express": "^4.16.0",
+    "throng": "4.0.0"
   }
 }