Fix syntax error in shell.nix

shell.nix

@@ -1,5 +1,5 @@
 { pkgs ? import <nixpkgs> {} }:
   pkgs.mkShell {
     # nativeBuildInputs is usually what you want -- tools you need to run
-    nativeBuildInputs = [ pkgs.nodejs-15_x pkgs.yarn pkgs.jq ];
+    nativeBuildInputs = with pkgs; [ nodejs-15_x yarn jq ];
-}
+}