Bump up version number to 9.2

Bump up version number to 9.1

Makefile.Cygwin

README.md (v8.5)

Bump up version number to 8.4

README.md (v8.3.1)

README.md (v8.3)

README.md (v8.2)

README.md (v8.1)

Update README.md (v8.0)