0.5.0

CHANGES:

• Update to ocamlformat.0.27.0 (@dinosaure, #49)

• Fix on Line.eta (@gasche, #48)

• Remove the Vector module and use the Dynarray module when it's available

  breaking change: progress provides a new sub-library progress.vector
  which, depending on the OCaml version, corresponds to the vector opam
  package for OCaml < 5.2.0 or Stdlib.Dynarray for OCaml >= 5.2.0. It unlocks
  the ability to link progress with some projects which define their own
  Vector module.