Log Message:
p5-Module-Signature: update to 0.87.

[Changes for 0.87 - Sat Jul  4 15:04:41 CST 2020]

* Skip 3-verify.t on Crypt::OpenPGP installations. (@pyramation)

[Changes for 0.86 - Thu Jun 25 21:06:24 CST 2020]

* Update PAUSE and ANDK keys to 2020. (@dweekly)

* Update documentation pertaining to SHA1. (@dweekly)

* Fix compatibility with Crypt::OpenPGP. (@niklasholm)