Update release notes.
Update release notes.

yukitos/FsCheck,ploeh/FsCheck,paulyoung/FsCheck,cloudRoutine/FsCheck,ErikSchierboom/FsCheck,fscheck/FsCheck,fscheck/FsCheck,paulyoung/FsCheck,jhamm/FsCheck,yukitos/FsCheck,forki/FsCheck,forki/FsCheck,sideeffffect/FsCheck,cloudRoutine/FsCheck,yukitos/FsCheck,fsharp/FsCheck