updated opam file

to reflect more the one from opam-repository

opam

@@ -9,7 +9,7 @@ authors: "OCaml batteries-included team"
 homepage: "http://batteries.forge.ocamlcore.org/"
 bug-reports: "https://github.com/ocaml-batteries-team/batteries-included/issues"
 dev-repo: "git://github.com/ocaml-batteries-team/batteries-included.git"
-license: "LGPL-2.1+ with OCaml linking exception"
+license: "LGPL-2.1-or-later with OCaml-LGPL-linking-exception"
 doc: "http://ocaml-batteries-team.github.io/batteries-included/hdoc2/"
 build: [
   ["ocaml" "setup.ml" "-configure" "--prefix" prefix]
@@ -18,7 +18,7 @@ build: [
 install: [make "install"]
 remove: ["ocamlfind" "remove" "batteries"]
 depends: [
-  "ocaml" {>= "3.12.1"}
+  "ocaml" {>= "4.00.0" & < "4.10.0"}
   "ocamlfind" {build & >= "1.5.3"}
   "ocamlbuild" {build}
   "qtest" {with-test & >= "2.5"}