Log Message:
(devel/p5-Date-Manip) Updated from 6.79 to 6.81. (+info 6.78 to 6.79)

6.81  2020-03-01
  -  Messed up the 6.80 package. This release fixes it.

6.80  2020-03-01
  -  Missed Changes entry for previous version.
         Reported by Tina Muller (GitHub #31)

6.79  2019-12-01
  -  Time zone fixes
         Newest zoneinfo data (tzdata 2019c).