Regenerate session on register (#610)

* Regenerate session on register

* Update RegisteredUserController.php

* Check if session exists before regenerating

---------

Co-authored-by: Taylor Otwell <taylor@laravel.com>

Author: valorin

src/Http/Controllers/RegisteredUserController.php

@@ -63,6 +63,10 @@ public function store(Request $request,
 
         $this->guard->login($user, $request->boolean('remember'));
 
+        if ($request->hasSession()) {
+            $request->session()->regenerate();
+        }
+
         return app(RegisterResponse::class);
     }
 }