use --json instead of --xml

README.md

@@ -352,16 +352,17 @@ You can find out if your evaluation succeeded by checking the [latest build job]
 In your `nur-packages/` folder, run the [check evaluation](https://github.com/nix-community/nur-packages-template/blob/master/.github/workflows/build.yml) task
 
 ```sh
-nix-env -f . -qa \* --meta --xml \
+nix-env -f . -qa \* --meta \
   --allowed-uris https://static.rust-lang.org \
   --option restrict-eval true \
   --option allow-import-from-derivation true \
   --drv-path --show-trace \
   -I nixpkgs=$(nix-instantiate --find-file nixpkgs) \
-  -I ./
+  -I ./ \
+  --json | jq -r 'values | .[].name'
 ```
 
-On success, this shows an XML document with a list of your packages
+On success, this shows a list of your packages
 
 ### Git submodules