update to new notation

src/libs/routes/signup.js

@@ -5,7 +5,7 @@ const signupApp = express();
 const libs = `${process.cwd()}/libs`;
 
 
-signupApp.post('/', function(req, res) {
+signupApp.post('/', (req, res) => {
   if (!req.body.email || !req.body.password) {
     res.json({success: false, msg: 'Please pass email and password.'});
   } else {
@@ -14,7 +14,7 @@ signupApp.post('/', function(req, res) {
       password: req.body.password
     });
     // save the user
-    newUser.save(function(err) {
+    newUser.save((err) => {
       if (err) {
         return res.json({success: false, msg: 'Email already in use.'});
       }