Major changes in Perl API for idnkit version 2.2:

* Support RFC6452, "The Unicode Code Points and Internationalized Domain
  Names for Applications (IDNA) - Unicode 6.0".
* Add the configuration variable $LDDLFLAGS to 'Makefile.PL'.
* Modify the license.  See 'LICENSE.txt'.

Major changes in Perl API for idnkit version 2.1:

* No major change.
  (idnkit and language APIs now share the same latest version "2.1".)

Major changes in Perl API for idnkit version 1.0:

* Initial release.
