• on auth method use key passphrase instead of password to
  refer to the private key passphrase - using password will be
  deprecated in future releases and is now warned
  
• add support for IPv6 via IO::Socket::IP (patch submitted by
  Baldur Kristinsson)
  
• use binmode when transferring data from/to the local
  filesystem in SCP methods
  
• add support for password-interact authentication
  
• add fallback option to auth method
  
• allow undef as the publickey path (patch submitted by Yuni
  Kim)
  
• on channel write method, when blocking mode is set, call
  libssh2_channel_write repeatly until the buffer is empty
  
• on channel read method, when non-blocking mode is set, don't
  call libssh2_channel_read repeatly until the buffer is
  filled
  
• add Net::SSH2 known_hosts method and Net::SSH2::KnownHosts
  class
  
• add keepalive_config and keepalive_send methods
  
• add channel methods "window_write", "window_read" and
  "receive_window_adjust"
  
• add "Compress" option into "connect" method
  
• add "flags" method
  
• exit_signal was generating SIGSEGV
  
• improve callback handling
  
• several documentation clarifications added
  
• fix several memory leaks
  
• fix several file descriptor leaks
  
• Lots of other minor tweaks