rockstarlang added to nixpkgs

Hello,

For your information, following #376 this project has been packaged to nixpkgs

It is now more easier for any Nix user to use your package

nix-shell --packages rockstarlang

https://search.nixos.org/packages?channel=unstable&type=packages&query=rockstarlang&show=rockstarlang

https://repology.org/project/rockstarlang/versions

Feel free to close this issue