Add HOST environment variable

app.js

@@ -2,6 +2,7 @@ require('dotenv').config({ silent: true })
 const express = require('express')
 const middleWarez = require('./index.js')
 const port = process.env.PORT || 3000
+const host = process.env.HOST || '127.0.0.1'
 
 const app = express()
 
@@ -15,6 +16,6 @@ app.get('/callback', middleWarez.callback)
 app.get('/success', middleWarez.success)
 app.get('/', middleWarez.index)
 
-app.listen(port, () => {
+app.listen(port, host, () => {
   console.log("gandalf is walkin' on port " + port)
 })