Fix NixOS module using incorrect output

README.md

@@ -74,7 +74,6 @@ Clone this repository, then run:
 ```sh
 cargo build --release
 ```
-You will need Rust 1.65 or newer.  
 The output binary will be in `target/release/url-eater`  
 
 Alternatively,

flake.nix

@@ -50,7 +50,7 @@
             config = mkIf cfg.enable {
               systemd.user.services."url-eater" = let
                 filters = pkgs.writeText "filters.kdl" cfg.filters;
-                pkg = self.defaultPackage.${pkgs.system};
+                pkg = self.packages.${pkgs.system}.default;
               in {
                 description = "Clipboard URL cleanup service";