update to Weather-PurpleAir-API 0.07.  changes:

0.07 - 2020-10-05
  * Fixed broken link in documentation (thanks, Dave Smith)
  * Fixed bin/aqi documentation

0.06 - 2020-09-25
  * Fixed bin/aqi documentation (thanks, Grinnz)
  * Fixed lib/Weather/PurpleAir/API.pm documentation (=E<gt> to => in code-quoted section)
  * Fixed missing dependencies in dist.ini
  * Corrected dependency versions in dist.ini to match RHEL6 repo package versions

0.05 - Sun Sep 20 18:20:50 2020
  * Fixed documentation.
  * dist.ini: Added missing prereq for JSON::MaybeXS

(mrg)