old_contents: const express = require('express')
  const path = require('path')
  const app = express()
  
  app.use(express.static('public'))
  
  app.get('/*', function (req, res) {
  	res.sendFile(path.join(__dirname + '/public/index.html'));
  })
  
  app.listen(3000, function () {
  	console.log('Example app listening on port 3000!')
  })
new_contents: const express = require('express')
  const path = require('path')
  const app = express()
  
  app.use(express.static('public'))
  
  app.get('/*', function (req, res) {
  	res.sendFile(path.join(__dirname + '/public/index.html'))
  })
  
  app.listen(process.env.PORT || 3000, function () {
  	console.log(process.env.PORT ? 'Example app listening!' : 'Example app listening on port 3000!')
  })
subject: fix port for heroku