fix error in README.md

README.md

@@ -1,2 +1,3 @@
 `nix build` or `nix run` to build lib or run the example
+
 to do it manually, run `./generate.sh` to generate `lib/` before `cabal build` or `cabal run`

flake.nix

@@ -46,7 +46,7 @@
         ];
         preBuild = ''
           set -x
-          export PATH=${hs-bindgen-cli}/bin:\$PATH
+          export PATH=${hs-bindgen-cli}/bin:$PATH
           ./generate.sh
           set +x
         '';