Log Message:
Updated package to latest version, 4.2, and changed distribution site and
homepage URL. Changes include:

    Add support for OCaml 4.05.0.
    Use the ocaml-migrate-parsetree library to support multiple versions of OCaml.
    Fix comparison order of fields in records (#136).
    Silence an unused rec flag warning in generated code (#137).
    Monomorphize comparison function for builtin types (#115)
    Raise an error when type nonrec is encountered (#116).
    Display an error message when dynamic package loading fails.
    Add a with_path option to @@deriving to skip the module path in generated \ 
code (#120).

The homepage for the project has now moved to: \ 
https://github.com/ocaml-ppx/ppx_deriving