[new release] pp (2.0.0)
CHANGES:
- Prepare release (ocaml-dune/pp#21, @mbarbin)
- Upgrade to `ocamlformat.0.26.2`.
- Fmt the code
- Add CI badge to README
- Upgrade GitHub workflow actions dependencies (checkout@v4, setup-ocaml@v3)
- Add more validation steps in CI
- Add `ocamlformat` as dev-setup dependency
- Add `Pp.verbatimf`. (ocaml-dune/pp#18, @mbarbin)
- Add `Pp.paragraph` and `Pp.paragraphf` (ocaml-dune/pp#19, @Alizter)
- Remove `of_fmt` constructor. (ocaml-dune/pp#17, @Alizter)