Fix styling

Author: MusahMusah

tests/Paystack/PaystackTest.php

@@ -40,8 +40,8 @@
         'reference' => '123456789',
         'callback_url' => 'https://example.com',
     ]))
-    ->toBeObject()
-    ->toBeInstanceOf(RedirectResponse::class);
+        ->toBeObject()
+        ->toBeInstanceOf(RedirectResponse::class);
 });
 
 it('can redirect to checkout for payment using request() arguments', function () {