setting up error code with res replaced by console.log (#290)

* setting up error code with res replaced by console.log

* Update server.js

server.js

@@ -18,6 +18,7 @@ function wrap(handler) {
   return (req, res) =>
     handler(req, res).catch(err => {
       console.log('ERR:', err)
+      res.status(400).end()
     })
 }