Log Message:
Update to 1.21:

libnet 1.21  -- Sat May 19 08:53:09 CDT 2007

Bug Fixes
  * Fix bug causing utf8 encoding of 8bit strings in Net::Cmd
  * Fix precedence issue in Net::NNTP. Patch from Brendan O'Dea
  * Fixed bug causing removal of last character on the line when
    doing ASCII FTP transfers

Enhancements
  * Add support for ENVID and AUTH to Net::SMTP. Patch by Mark Martinec
  * Changed default for FTP transfers to be passive
  * Added support for FTP FEAT command