Restrict to charrua-core 0.4.

This should be the last commit for 0.4.

.travis.yml

@@ -8,11 +8,19 @@ env:
   global:
   - PACKAGE="charrua-unix.9999"
   matrix:
-  - DISTRO="debian-stable" OCAML_VERSION="4.02.3"
-  - DISTRO="debian-testing" OCAML_VERSION="4.03.0"
-  - DISTRO="ubuntu-14.04" OCAML_VERSION="4.02.3"
-  - DISTRO="ubuntu-16.04" OCAML_VERSION="4.02.3"
-  - DISTRO="centos-7" OCAML_VERSION="4.02.3"
-  - DISTRO="centos-6" OCAML_VERSION="4.02.3"
   - DISTRO="alpine-3.4" OCAML_VERSION="4.03.0"
+  - DISTRO="alpine-3.4" OCAML_VERSION="4.04.0"
+  - DISTRO="centos-6" OCAML_VERSION="4.03.0"
+  - DISTRO="centos-6" OCAML_VERSION="4.04.0"
+  - DISTRO="centos-7" OCAML_VERSION="4.03.0"
+  - DISTRO="centos-7" OCAML_VERSION="4.04.0"
+  - DISTRO="debian-stable" OCAML_VERSION="4.03.0"
+  - DISTRO="debian-stable" OCAML_VERSION="4.04.0"
+  - DISTRO="debian-testing" OCAML_VERSION="4.03.0"
+  - DISTRO="debian-testing" OCAML_VERSION="4.04.0"
   - DISTRO="fedora-24" OCAML_VERSION="4.03.0"
+  - DISTRO="fedora-24" OCAML_VERSION="4.04.0"
+  - DISTRO="ubuntu-14.04" OCAML_VERSION="4.03.0"
+  - DISTRO="ubuntu-14.04" OCAML_VERSION="4.04.0"
+  - DISTRO="ubuntu-16.04" OCAML_VERSION="4.03.0"
+  - DISTRO="ubuntu-16.04" OCAML_VERSION="4.04.0"

opam

@@ -7,15 +7,15 @@ homepage: "https://github.com/haesbaert/charrua-unix"
 bug-reports: "https://github.com/haesbaert/charrua-unix/issues"
 license: "ISC"
 dev-repo: "https://github.com/haesbaert/charrua-unix.git"
-available: [ocaml-version >= "4.02" & opam-version >= "1.2"]
+available: [ocaml-version >= "4.03" & opam-version >= "1.2"]
 build: [
   ["sh" "build.sh"]
 ]
 depends: [
   "ocamlfind"
   {build}
   "lwt"
-  "charrua-core" {> "0.4"}
+  "charrua-core" {= "0.4"}
   "cmdliner"
   "rawlink"
   "tuntap"