CHANGES:
- Add support for OCaml 4.11 (#36)
(Thierry Martinez, review by Gabriel Scherer) - Add support for OCaml 4.12 (#39)
(Kate Deplaix, review by Gabriel Scherer) - Port to ppx_deriving 5.0 and ppxlib (#39)
(Kate Deplaix, review by Gabriel Scherer) - Upgrade the tests from ounit to ounit2 (#39)
(Kate Deplaix, review by Gabriel Scherer)