* Dario Teixeira: migrate syntax extension from OCaml-pcre to OCaml-re.
* Rudi Grinberg: migrate core library from OCaml-pcre to OCaml-re.
* Rudi Grinberg: add unit tests for regular expressions.
* Evgenii Lepikhin: add support for types UUID and JSONB.
* Philippe Wang: add support for type CITEXT.