Node version set in application settings

Removing engines parameter to avoid confusion.
See quickstart here: https://docs.microsoft.com/en-us/azure/app-service/app-service-web-get-started-nodejs

package.json

@@ -5,9 +5,6 @@
     "private": true,
     "license": "MIT",
     "author": "Microsoft",
-    "engines": {	
-        "node": ">=6.9.1"	
-    },
     "scripts": {
         "start": "node index.js"
     }