Class::DBI::Plugin::DateTime requires DBD::Pg?

G'day Daisuke (or anyone else helping maintain the module ..),

We've just installed your Class::DBI::Plugin::DateTime module. We're 
using it for mySQL, but it requires us to install Postgres modules. Any 
chance you can remove them from the required libs and only run the tests 
if they're installed?

     DBD::Pg
     DateTime::Format::Pg

Cheers!
Rick Measham