Add a lower bound on dune-configurator

Add some information about thread safety

Remove the lacaml dependence — no longer needed for tests

Fix reading a whole file for Windows

Only call “dune subst” for “dev”

Fix the “plan_hash” return value

Replace Travis & AppVeyor with Github Actions

Make license adhere the SPDX standard

Fix deprecation warnings

Update changes

Update dev compilers

Remove macos special case in opam build rules

Update to dune-configurator

Add missing OPAM dependency

Remove workaround in the documentation