ppx_tyre needs ocaml >= 4.06.0.

Author: paurkedal

.travis.yml

@@ -7,7 +7,7 @@ services:
 env:
   matrix:
     - IMAGE_NAME=ocaml/opam2:4.03 PKG_NAME=ppx_regexp
-    - IMAGE_NAME=ocaml/opam2:4.03 PKG_NAME=ppx_tyre
+    - IMAGE_NAME=ocaml/opam2:4.06 PKG_NAME=ppx_tyre
     - IMAGE_NAME=ocaml/opam2:4.07 PKG_NAME=ppx_regexp
     - IMAGE_NAME=ocaml/opam2:4.07 PKG_NAME=ppx_tyre
 

ppx_tyre.opam

@@ -17,4 +17,4 @@ depends: [
   "tyre" {>= "0.4.1"}
   "qcheck" {test}
 ]
-available: [ocaml-version >= "4.02.3"]
+available: [ocaml-version >= "4.06.0"]