1.3.0

CHANGES:

Added

• Add support for [@as "field_name"] attribute to allow forbidden
  ocaml record field names, such as capitalized words, to be used as JSON
  objects field names (#40, @mefyl)

Changed

• Ignore leading underscores in object field names allowing use
  of ocaml keywords such as type or object as JSON objects field names
  (#40, @mefyl)