Log Message:
p5-Parse-Yapp: update to 1.21.

1.20 Wed Jun 14 2017
    - Bug Fix, CPAN Version Dependencies Failure,
      Enable Module Version In Parse::Yapp,
      Not Just Distribution Version In Parse::Yapp::Driver
    - Bump Version
1.21 Fri Aug 04 2017
    - Typo Fixes, POD Spelling (thanks to Gregor Herrmann)
    - Bug Fix, Missing POD Encoding (thanks to Gregor Herrmann)