6.0.0

CHANGES:

• Fix a bug in [@@deriving make] that caused errors when it was used on a set
  of type declarations containing at least one non record type.
  #281
  (@NathanReb)

• Embed errors instead of raising exceptions when generating code
  with ppx_deriving.make
  #281
  (@NathanReb)

• Remove [%derive.iter ...], [%derive.map ...] and [%derive.fold ...]
  extensions
  #278
  (Simmo Saan)

• Port standard plugins to ppxlib registration and attributes
  #263
  (Simmo Saan)

• Optimize forwarding in eq and ord plugins
  #252
  (Simmo Saan)

• Delegate quoter to ppxlib
  #263
  (Simmo Saan)

• Introduce Ppx_deriving_runtime.Stdlib with OCaml >= 4.07.
  This module already exists in OCaml < 4.07 but was missing otherwise.
  #258
  (Kate Deplaix)