[ANN] New release of PPrint (2023830)

It is my pleasure to announce a new release of PPrint, the pretty-printing library, with the following additions:

  • The new function is_empty allows testing (in constant time) whether
    a document is empty.

  • Documentation: add a warning about the time and space complexity of
    a naive use of ifflat.

The library now requires OCaml 4.03 or newer.