Revision history for Module::Used.
1.3.0  2012-09-27
    New modules_used_by_modules(), thanks to Neil Bowers.
1.2.0  2008-12-08
    Case-insensitive sort.
    Now looks for "extends" and "with" when Moose or Moose::Role are used.
1.1.0  2008-07-06
    Now recursivly finds Perl code.
1.0.1  2008-06-16
    Require perl 5.8.3.  Due to site/core @INC issues, requiring Exporter 5.57
    isn't good enough.
1.0.0  2008-06-15
    Initial release.