pywal16: add updateScript

Author: Moraxyc

pkgs/by-name/py/pywal16/package.nix

@@ -4,6 +4,7 @@
   fetchFromGitHub,
   imagemagick,
   installShellFiles,
+  nix-update-script,
 }:
 
 python3.pkgs.buildPythonApplication rec {
@@ -50,6 +51,8 @@ python3.pkgs.buildPythonApplication rec {
     ];
   };
 
+  passthru.updateScript = nix-update-script { };
+
   meta = {
     description = "16 colors fork of pywal";
     homepage = "https://github.com/eylles/pywal16";