Log Message:
Updated package to latest version, 3.0.0. Changes include:

Features/Changes

    Misc: switch to ppx instead of camlp4
    Misc: always install deriving_json
    Misc: remove support for async_kernel, bin_prot
    Misc: remove support for ppx_driver
    Misc: split js_of_ocaml in multiple packages
    Misc: switch to jbuilder
    Misc: new pseudo filesystem support with better node support
    Compiler: sourcemap support is now optional
    Compiler: no more strong dep on yojson, b64, menhir, ocamllex
    Compiler: improve separate compilation workflow
    Runtime: add support for weakdef
    Syntaxes: add expect tests
    Syntaxes: switch to ocaml-migrate-parsetree and ppx_tools_versioned
    Lib: Add primitives in [Js.Unsafe]
    Lib: remove keycode module, replaced by Dom_html.Keyboard_code
    Lib: XmlHttpRequest, API change for perform functions.

Bug fixes:

    Runtime: fix many stubs
    Lib: fix many signatures
    Compiler: fix performance of compilation passes (simpl,clean)
    Compiler: fix compat with OCaml 4.06
    Toplevel: flush channels after execution.
    Toplevel: fix toplevel generation when using -export-unit