Log Message:
pkgsrc changes:
  - Updating package for p5 module DateTime::Set from 0.27 to 0.28
  - Setting license to ${PERL5_LICENSE} according to module POD

Upstream changes:
0.28   2009-07-19
- optimized DateTime::Set->as_list().
  This works around a segfault reported by Nils Grunwald.