Log Message:
Updating devel/p5-MooseX-Singleton from 0.21nb1 to 0.22

pkgsrc changes:
  - Adjusting dependencies

Upstream changes:
0.22 2009-12-25
    - The ->initialize method was both broken and undocumented. RT
      #51260. (Dave Rolsky)
    - Updated docs to encourage use of ->instance and ->initialize, and
      discourage calling ->new directly. Doing so may be deprecated in a
      future release. (Dave Rolsky)