Release Prolific version 31.0.0-alpha.1.
Release Prolific version 31.0.0-alpha.1.

 * Fix monitoring of short-lived programs. Closes #1346.
 * Caret pin Destructible to 6.2.1. Closes #1345.
 * Upgrade `prolific.shuttle` to `^27.1.0`. Closes #1344.
 * Notes on process groups. See #1339.
 * Notes on the directions in which messages passed.

Closes #1347.

bigeasy/prolific,bigeasy/prolific