okolors: modernize a bit

pkgs/by-name/ok/okolors/package.nix

@@ -2,6 +2,7 @@
   lib,
   rustPlatform,
   fetchFromGitHub,
+  nix-update-script,
 }:
 
 rustPlatform.buildRustPackage (finalAttrs: {
@@ -9,21 +10,28 @@ rustPlatform.buildRustPackage (finalAttrs: {
   version = "0.9.0";
 
   src = fetchFromGitHub {
-    owner = "Ivordir";
+    owner = "IanManske";
     repo = "Okolors";
-    rev = "v${finalAttrs.version}";
+    tag = "v${finalAttrs.version}";
     hash = "sha256-RSkZUkwCn9uvvT2dIqM2Q4+mRqjUegVuXCms5DBugbk=";
   };
 
   cargoHash = "sha256-ceFyFbNmC7PoleTejymQw9Ii9rxx2qJmFifNAQjLVUM=";
 
+  passthru = {
+    updateScript = nix-update-script { };
+  };
+
+  __structuredAttrs = true;
+
   meta = {
     description = "Generate a color palette from an image using k-means clustering in the Oklab color space";
-    homepage = "https://github.com/Ivordir/Okolors";
+    homepage = "https://github.com/IanManske/Okolors";
     license = lib.licenses.mit;
     maintainers = with lib.maintainers; [
       sandarukasa
     ];
+    changelog = "https://github.com/IanManske/Okolors/releases/tag/v${finalAttrs.version}";
     mainProgram = "okolors";
   };
 })