Fix opam dependency resolution

Author: balat

opam

@@ -1,6 +1,6 @@
 opam-version: "2.0"
 name: "ocsigen-toolkit"
-version: "3.3.0"
+version: "3.3.1"
 maintainer: "dev@ocsigen.org"
 synopsis: "Reusable UI components for Eliom applications (client only, or client-server)"
 description: "The Ocsigen Toolkit is a set of user interface widgets that facilitate the development of Eliom applications."
@@ -14,6 +14,6 @@ install: [ make "install" ]
 depends: [
   "ocaml" {>= "4.08.0"}
   "js_of_ocaml" {>= "4.1.0"}
-  "eliom" {>= "6.12.1"}
+  "eliom" {>= "10.0.0"}
   "calendar" {>= "2.0.0"}
 ]