openflow.0.5.0 / frenetic.3.0.0

Release notes for openflow.0.5.0 can be found [here](https://github.com/frenetic-lang/ocaml-openflow/releases/tag/v0.5.0), and the same for frenetic.3.0.0 can be found [here](https://github.com/frenetic-lang/frenetic/releases/tag/v3.0.0)