hashset: updated opam file

relaxed the constraint ocaml < 5.0.0

Author: backtracking

packages/hashset/hashset.1.0.0/opam

@@ -1,9 +1,9 @@
 opam-version: "2.0"
-maintainer: "Jean-Christophe.Filliatre@lri.fr"
+maintainer: "Jean-Christophe.Filliatre@cnrs.fr"
 authors: ["Jean-Christophe Filliâtre"]
-homepage: "https://www.lri.fr/~filliatr/software.en.html"
-bug-reports: "https://github.com/UnixJunkie/hashset/issues"
-dev-repo: "git+https://github.com/UnixJunkie/hashset.git"
+homepage: "https://github.com/backtracking/hashset"
+bug-reports: "https://github.com/backtracking/hashset/issues"
+dev-repo: "https://github.com/backtracking/hashset"
 license: "LGPL-2.1-only"
 build: [
   ["obuild" "configure"]
@@ -16,7 +16,7 @@ remove: [
   ["ocamlfind" "remove" "hashset"]
 ]
 depends: [
-  "ocaml" {< "5.0.0"}
+  "ocaml"
   "ocamlfind"
   "obuild" {build & >= "0.1"}
 ]