updated opam file with bits from the one in opam-repository

opam

@@ -1,10 +1,14 @@
-opam-version: "1.2"
-name: "batteries"
-maintainer: "thelema314@gmail.com"
+opam-version: "2.0"
+synopsis: "A community-maintained standard library extension"
+maintainer: [
+  "Francois Berenger <unixjunkie@sdf.org>"
+  "Gabriel Scherer <gabriel.scherer@gmail.com>"
+  "Thibault Suzanne <thi.suzanne@gmail.com>"
+]
 authors: "OCaml batteries-included team"
 homepage: "http://batteries.forge.ocamlcore.org/"
 bug-reports: "https://github.com/ocaml-batteries-team/batteries-included/issues"
-dev-repo: "https://github.com/ocaml-batteries-team/batteries-included.git"
+dev-repo: "git://github.com/ocaml-batteries-team/batteries-included.git"
 license: "LGPL-2.1+ with OCaml linking exception"
 doc: "http://ocaml-batteries-team.github.io/batteries-included/hdoc2/"
 build: [
@@ -14,10 +18,14 @@ build: [
 install: [make "install"]
 remove: ["ocamlfind" "remove" "batteries"]
 depends: [
-  "ocamlfind" {>= "1.5.3"}
+  "ocaml" {>= "3.12.1"}
+  "ocamlfind" {build & >= "1.5.3"}
   "ocamlbuild" {build}
-  "qtest" {test & >= "2.5"}
-  "qcheck" {test & >= "0.6"}
+  "qtest" {with-test & >= "2.5"}
+  "qcheck" {with-test & >= "0.6"}
   "num"
 ]
-available: [ocaml-version >= "3.12.1"]
+#url {
+#  src: "https://github.com/ocaml-batteries-team/batteries-included/releases/download/vXXX/batteries-XXX.tar.gz"
+#  checksum: "md5=XXX"
+#}