sync local opam file with mirage/mirage-dev package
sync local opam file with mirage/mirage-dev package

samoht/ocaml-vchan,mirage/ocaml-vchan,samoht/ocaml-vchan,djs55/ocaml-vchan,samoht/ocaml-vchan,mirage/ocaml-vchan,djs55/ocaml-vchan,djs55/ocaml-vchan,mirage/ocaml-vchan