Update CHANGES, preparing for release.
Update CHANGES, preparing for release.

rgrinberg/lwt,ocsigen/lwt,ocsigen/lwt,rneswold/lwt,c-cube/lwt,rneswold/lwt,c-cube/lwt,rgrinberg/lwt,rgrinberg/lwt,ocsigen/lwt,c-cube/lwt,mfp/lwt,rneswold/lwt,rgrinberg/lwt,mfp/lwt