Fixed robots.txt

config/routes/index.js

@@ -32,9 +32,10 @@ module.exports = router
 
   // robots.txt
   .get('/robots.txt', (req, res) => {
-    res.type('text/plain')
-    res.send('User-agent: *\n' +
-      'Disallow: /map/*\n'
+    res.set('Content-Type', 'text/plain')
+    .send('User-agent: *\n' +
+      'Disallow: /map/*\n' +
+      'Allow: /map/demo'
     )
   })