message: Make all ports consistent in README example
diff: @@ -57,9 +57,10 @@ const express = require('express');
  const session = require('express-session');
  const xero_node = require('xero-node')
  +const port = process.env.PORT || 3000
  const client_id = 'YOUR-CLIENT_ID'
  const client_secret = 'YOUR-CLIENT_SECRET'
  -const redirectUri = 'http://localhost:5000/callback'
  +const redirectUri = `http://localhost:${port}/callback`
  const scopes = 'openid profile email accounting.transactions accounting.settings offline_access'
  const xero = new xero_node.XeroClient({
  @@ -71,7 +72,7 @@ const xero = new xero_node.XeroClient({
  let app = express()
  -app.set('port', (process.env.PORT || 3000))
  +app.set('port', port)
  app.use(express.static(__dirname + '/public'))
  app.use(session({
  secret: 'something crazy',
  @@ -116,9 +117,8 @@ app.get('/organisation', async function(req, res) {
  }
  })
  -const PORT = process.env.PORT || 5000;
  -app.listen(PORT, function() {
  - console.log("Your Xero basic public app is running at localhost:" + PORT)
  +app.listen(port, function() {
  + console.log("Your Xero basic public app is running at localhost:" + port)
  })
  ```
  