stown: add nix-update-script

Author: rseichter

pkgs/by-name/st/stown/package.nix

@@ -4,6 +4,7 @@
   fetchFromGitHub,
   tree,
   versionCheckHook,
+  nix-update-script,
 }:
 let
   version = "1.2.0";
@@ -30,6 +31,8 @@ python3Packages.buildPythonApplication {
     versionCheckHook
   ];
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "Manage file system object mapping via symlinks. Lightweight alternative to GNU Stow";
     homepage = "https://www.seichter.de/stown/";