0.03 2011-07-07

    * ATTENTION: RT4 has this functionality built in
    * make sure ext can not be installed on RT4
    * make sure ext can not be enabled on RT4
    * document upgrade procedure

0.02 2009-07-03

    * typo in the doc that mess CPAN's indexer

0.01 2009-07-03

    * initial release
