Log Message:
Update from version 0.20 to version 0.21.

Upstream changes:
0.21 Thu. Aug 27 2009
  * MooseX::Getopt
    - Enable and document the argv parameter to the constructor.
    - Applied patches in RT43200 and RT43255
    - Applied patch from RT#47766 to not die if SimpleConfig cannot find the
      default config file name.