add version information to about page

lib/index.js

@@ -26,6 +26,8 @@ const limiter = rateLimit({
   windowMs: 60 * 1000,
   max: 10,
 })
+const pkg = require('../package.json')
+const version = pkg.version || ''
 
 // Force app to always redirect to HTTPS
 // use when you can't configure web server
@@ -63,7 +65,7 @@ app.get('/error', (req, res) => {
 })
 
 app.get('/about', (req, res) => {
-  res.render('about')
+  res.render('about', { version })
 })
 
 // NOTE: Capture all unkown URLs