pgformatter: add update script

pkgs/by-name/pg/pgformatter/package.nix

@@ -3,6 +3,7 @@
   perlPackages,
   fetchFromGitHub,
   versionCheckHook,
+  nix-update-script,
 }:
 
 perlPackages.buildPerlPackage rec {
@@ -43,6 +44,8 @@ perlPackages.buildPerlPackage rec {
   versionCheckProgramArg = "--version";
   doInstallCheck = true;
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "PostgreSQL SQL syntax beautifier that can work as a console program or as a CGI";
     homepage = "https://github.com/darold/pgFormatter";