New release + Fix OPAM?

[pmetzger]

The opam file in the main directory claims release 0.9 runs on ocaml 4.05 and higher, but the opam file in the opam repository claims only under 4.05. I suspect that, in fact, only the code at the head of the repo runs in 4.05 and higher.

Perhaps a new release should be cut and an updated opam file submitted?