return json for panic endpoint

Author: rideam

complete-application/routes/index.js

@@ -7,7 +7,7 @@ router.get('/', function (req, res, next) {
 });
 
 router.post('/panic', hasRole(['teller']), function (req, res, next) {
-  res.send("We've called the police!");
+  res.json({ message: "We've called the police!" });
 });
 
 router.get('/make-change', hasRole(['customer', 'teller']), function (req, res, next) {
@@ -23,4 +23,4 @@ router.get('/make-change', hasRole(['customer', 'teller']), function (req, res,
   res.json(result);
 });
 
-module.exports = router;
+module.exports = router;