Omp ocaml-migrate-parsetree-1.2.0

See full changelog
  • Remove unused ocamlfind dependency in the opam file (#53, @diml)
  • Add --print-transformations to list registered transformations (#55, @rgrinberg)
  • Fix Windows compatibility by setting the output to binary mode when writing a binary ast (#57, #59, @bryphe and @dra27)
  • Switch to dune and opam 2.0 (#58, #60, @diml)