Log Message:
p5-Net-HTTP: update to 6.21.

6.21      2021-03-18 21:56:42Z
    - Accept PeerAddr of 0. (GH#72) (trwyant)

6.20      2021-01-08 16:22:23Z
    - Replace last use of "vars" with "our" (GH#67) (James \ 
Raspass)