svtplay-dl: add updateScript

pkgs/by-name/sv/svtplay-dl/package.nix

@@ -2,6 +2,7 @@
   lib,
   fetchFromGitHub,
   installShellFiles,
+  nix-update-script,
   python3Packages,
   perl,
   ffmpeg,
@@ -76,6 +77,8 @@ buildPythonApplication {
     $out/bin/svtplay-dl --help > /dev/null
   '';
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     homepage = "https://github.com/spaam/svtplay-dl";
     description = "Command-line tool to download videos from svtplay.se and other sites";