fix linting error in auth controller

Author: gauravprwl14

server/controllers/auth.controller.js

@@ -20,10 +20,13 @@ function login(req, res, next) {
     // Ideally you'll fetch this from the db
     // Idea here was to show how jwt works with simplicity
     if (req.body.username === user.username && req.body.password === user.password) {
-        const token = jwt.sign({
-            username: user.username,
-            expiresIn: 3600,
-        }, config.jwtSecret);
+        const token = jwt.sign(
+            {
+                username: user.username,
+                expiresIn: 3600,
+            },
+            config.jwtSecret,
+        );
         return res.json({
             token,
             username: user.username,