flex-ncat: provide update script

pkgs/by-name/fl/flex-ncat/package.nix

@@ -2,6 +2,7 @@
   lib,
   buildGoModule,
   fetchFromGitHub,
+  nix-update-script,
 }:
 
 buildGoModule rec {
@@ -17,6 +18,8 @@ buildGoModule rec {
 
   vendorHash = "sha256-RqQMCP9rmdTG5AXLXkIQz0vE7qF+3RZ1BDdVRYoHHQs=";
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     homepage = "https://github.com/kc2g-flex-tools/nCAT";
     description = "FlexRadio remote control (CAT) via hamlib/rigctl protocol";