python3Packages.pytest-unmagic: add update script

pkgs/development/python-modules/pytest-unmagic/default.nix

@@ -3,6 +3,7 @@
   buildPythonPackage,
   fetchFromGitHub,
   pytestCheckHook,
+  gitUpdater,
   flit-core,
   pytest,
 }:
@@ -29,6 +30,8 @@ buildPythonPackage rec {
 
   pythonImportsCheck = [ "unmagic" ];
 
+  passthru.updateScript = gitUpdater { rev-prefix = "v"; };
+
   meta = {
     description = "Pytest fixtures with conventional import semantics";
     homepage = "https://github.com/dimagi/pytest-unmagic";