Complete all tasks

app/Http/Controllers/UserController.php

@@ -11,7 +11,7 @@ class UserController extends Controller
     {
         // TASK: change this line to not allow is_admin field to be updated
         // Update only the fields that are validated in UpdateUserRequest
-        $user->update($request->all());
+        $user->update($request->except(['is_admin']));
 
         return 'Success';
     }