Release Kibitz version 3.0.0-alpha.5.
Release Kibitz version 3.0.0-alpha.5.

 * Complete upstream upgrades.
 * Upgrade `destructible` to `^7.0.0-alpha.38`.
 * Upgrade `avenue` to `^0.6.8`.
 * Upgrade `proof` to `^9.0.3`.
 * Remove Rescue dependency.
 * Update `LICENSE` for 2021.
 * Build with Node.js 12, 14 and 15 on CI/CD.

Closes #256.

bigeasy/kibitz,bigeasy/kibitz