[1999/08/18]
* version 1.4.1
  - extconf.rb supports glibc2(libc6).
  
[1999/03/09]
* version 1.4
  - require ruby-1.3 or later version.
  - sShadowPasswd,mShadow,eFileLock was renamed.
  - FileLock class is inner class of Shadow Module.
  - lock,unlock was changed.
  - lock? method was added.
  - getspent,fgetspent doesn't raise EOFError
  - class hierarchy was changed.
      Shadow Module
       +  Passwd Module
           + Entry Structure
       +  Group Module (not implemented yet)
           + Entry Structure (not implemented yet)
       +  FileLock Class

[1998/12/17]
* version 1.3
  - require ruby-1.1d0 or later version.

[1998/10/31]
* version 1.2
  - only some bug fix.

[1998/08/31]
* version 1.1
  - structure Shadow::ShadowPasswd is added.

[1998/07/15]
* version 1.0 released.