15.1.0+dune

CHANGES:

• Unicode 15.1.0 support.
• Requires OCaml 4.14.0 for the UTF decoders.
• The Uuseg_string module was rewritten to use the standard library
  UTF decoders and was moved to the uuseg library. The uuseg.string
  library is deprecated, it warns on usage and simply requires uuseg.
• The sample code was rewritten to use the standard library UTF
  decoders.

14.0.0+dune

CHANGES:

• Unicode 14.0.0 support.