python3Packages.rmrl: add updateScript (#444758)

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

@@ -3,6 +3,7 @@
   buildPythonPackage,
   pythonOlder,
   fetchFromGitHub,
+  unstableGitUpdater,
   poetry-core,
   pdfrw,
   reportlab,
@@ -51,6 +52,8 @@ buildPythonPackage {
 
   pythonImportsCheck = [ "rmrl" ];
 
+  passthru.updateScript = unstableGitUpdater { };
+
   meta = {
     description = "Render reMarkable documents to PDF";
     homepage = "https://github.com/benneti/rmrl";