0.04 2014-02-19
 - Direct users to the 4.0 upgrade script
 - Better document as deprecated

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