fix(test): minor issue with invalid username

Author: skyme5

tests/test_snapchat_dl.py

@@ -46,7 +46,7 @@ def test_class_init(self):
 
     def test_invalid_username(self):
         """Test snapchat_dl Stories are not available."""
-        with self.assertRaises(NoStoriesFound):
+        with self.assertRaises(UserNotFoundError):
             self.snapchat_dl.download("username")
 
     @mock.patch("snapchat_dl.snapchat_dl.SnapchatDL._api_response")