Log Message:
p5-DateTime: update to 1.5200.

1.52   2020-02-29

- Added a $dt->is_between($dt1, $dt2) method. Based on GH #97 by philip r
  brenan.

- Simplify the calculation of leap seconds in XS. This is a little more
  efficient for most use cases (anything with future or recent past
  datetimes). Contributed by Mark Overmeer. GH #91.