Add chez and lein to the local nix pkgs

Olical · Olical · commit 22e37a2578f9 · 2021-10-24T14:19:38.000+01:00
diff --git a/shell.nix b/shell.nix
@@ -20,6 +20,8 @@ in
     nativeBuildInputs = with pkgs; [
       unstable.mitscheme
       unstable.guile
+      unstable.chez
+      unstable.leiningen
       unstable.racket
       unstable.janet
       unstable.chicken
