• Note version change: synced to libssh2. Should be compatible with
  libssh2 0.16+, including future versions provided API remains stable.
  
• Documented Net::SSH2::version class method.
  
• Removed references to LIBSSH2_APINO (removed in libssh2 0.16);
  fixes rt.cpan.org #28722.
  
• Fixed memory leak in poll (rt.cpan.org #27368, based on patch
  from David Sullivan).
  
• Fixed 0-valued POSIX flag translation bug (based on patch from Joseph
  Galbraith).
  
• Check lib64 as well as lib for libraries (patch from Leo Eraly).
  
• Add blocking method to Net::SSH2 object.