Update Pod-Simple to CPAN version 3.18

Update Pod-Simple to CPAN version 3.18

  [DELTA]

  2011-07-16   David E. Wheeler <david@justatheory.org>
        * Release 3.18

        Pod::Simple now properly parses Pod files using Mac OS Classic line-
        endings (\r). Marc Green/Google Summer of Code.

        Fixed test failure in 't/search50.t when the test finds a .pod but
        the module is in a .pm. Thanks to the cpan-testers who reported
        this when the test searched for Capture::Tiny.