0.20
- initial public release

0.21
- accidentaly a debug version left my computer. It reads descriptor 0
instead of 3. It's fixed now.

0.22
- fix for a crash when user is not found in the passwd database. 
- Support for PLAIN/LOGIN auth (so you can use cmd5checkpw for both CRAM-MD5
and PLAIN/LOGIN). Changes contributed by Javier Kohen <jkohen@tough.com>.