update CHANGES
update CHANGES

Ignore-this: 5dd34a0e9bed2eae4c2bff47701f808a

darcs-hash:20120822073049-c41ad-d015c64b74da69ca1e8d7e844d87a28ea3492881

rgrinberg/lwt,janestreet/lwt-async,mfp/lwt,fdopen/lwt,gfxmonk/lwt,mirage/lwt,ocsigen/lwt,fdopen/lwt,ocsigen/lwt,gfxmonk/lwt,c-cube/lwt,mfp/lwt,mirage/lwt,rneswold/lwt,rneswold/lwt,ocsigen/lwt,rgrinberg/lwt,janestreet/lwt-async,rneswold/lwt,c-cube/lwt,rgrinberg/lwt,rgrinberg/lwt,c-cube/lwt