vcard: enable auto-update

pkgs/development/python-modules/vcard/default.nix

@@ -2,6 +2,7 @@
   buildPythonPackage,
   fetchFromGitLab,
   lib,
+  nix-update-script,
   pytestCheckHook,
   python-dateutil,
   pythonAtLeast,
@@ -27,6 +28,8 @@ buildPythonPackage rec {
 
   pythonImportsCheck = [ "vcard" ];
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     homepage = "https://gitlab.com/engmark/vcard";
     description = "vCard validator, class and utility functions";