Log Message:
Update to 0.20

Upstream changes:
0.20      2014-09-06 23:04:12Z
  - Moose earlier than 2.0300 had a broken ->does method, which called methods
    on a class's meta when it might not be initialized (RT#98424)

0.19      2014-06-17 04:57:07Z
  - more comprehensive testing with Moo/Mouse/Moose
  - fixed cleaning of constants

0.18      2014-06-14 20:12:59Z
  - better method detection for Mouse (github #4, Graham Knop)

0.17      2014-06-10 20:13:14Z
  - Add -except to import options. This allows you to explicitly not clean a
    sub. (github #3, Dave Rolsky)

0.16      2014-05-27 04:50:22Z (TRIAL RELEASE)
  - Changed the code to no longer _require_ Class::MOP. If your class is not a
    Moose class then we don't load Class::MOP. This was particularly
    problematic for Moo classes. Using namespace::autoclean with a Moo class
    "upgraded" it to be a Moose class.
  - Using this module broke overloading in a class. Reported by Chris
    Weyl. (RT#50938)

0.15      2013-12-14 17:47:21Z
  - update configure_requires checking in Makefile.PL, add CONTRIBUTING file

0.14      2013-10-09 03:06:00Z
  - bump dependency on B::Hooks::EndOfScope, to get the separation of
    pure-perl and XS components (RT#89245)
  - repository migrated to the github moose organization