add dev env packages to depends

dune-project

@@ -22,6 +22,12 @@
  (synopsis "A short synopsis")
  (description "A longer description")
  (depends
+   ;; development env
+   utop
+   ocaml-lsp-server
+   ocamlformat
+
+   ;; deps
    ocaml
    dune
    re
@@ -29,11 +35,14 @@
    iter
    dune-site
    angstrom
+
+   ;; ppx
    ppx_deriving
    ppx_deriving_hash
    ppx_regexp
    ppx_expect
-   ppx_inline_test)
+   ppx_inline_test
+ )
  (sites (lib inputs))
  (tags
   (topics "to describe" your project)))