Fix nps

Author: hirsch88

package.json

@@ -4,10 +4,13 @@
   "description": "A delightful way to building a RESTful API with NodeJs & TypeScript",
   "main": "src/app.ts",
   "scripts": {
-    "start": "nps",
+    "start": "\"./node_modules/.bin/nps\"",
     "test": "npm start test",
     "build": "npm start build"
   },
+  "engines": {
+    "node": ">=8.0.0"
+  },
   "repository": "git+ssh://git@github.com/w3tec/express-typescript-boilerplate.git",
   "keywords": [
     "NodeJS",