v5.0

CHANGES:

• Migrate to ppxlib #206, #210
  (Anton Kochkov, Gabriel Scherer, Thierry Martinez)

v4.5

• Add support for OCaml 4.11.

  • Ppx_deriving.string_of_{constant,expression}_opt to destruct Pconst_string in a version-independent way
    #220, #222
    (Kate Deplaix, Thierry Martinez, review by Gabriel Scherer)

• Stronger type equalities in Ppx_deriving_runtime (for instance, Ppx_deriving_runtime.result and Result.result are now compatible with all OCaml versions)
  #223, #225
  (Thierry Martinez, review by Gabriel Scherer)

• Ppx_deriving_runtime.Option compatibility module
  #222
  (Thierry Martinez, review by Gabriel Scherer)