Release Compassion Conference version 3.0.0-alpha.0.
Release Compassion Conference version 3.0.0-alpha.0.

title: Release Compassion Conference version 3.0.0-alpha.0.
label: release

 * Convert to `async`/`await`. See #462.
 * Update `LICENSE`s for 2020. Closes #482.
 * Caret pin sibling dependencies of Conference. Closes #479.
 * Remove Montonic dependency from Conference. Closes #478.
 * Remove `p-queue` dependency. Closes #477.
 * Upgrade `avenue` to `0.2.0-alpha.1`. Closes #476.
 * Upgrade `cubbyhole` to `3.0.0-alpha.2`. Closes #475.
 * Upgrade `interrupt` to `9.0.0-alpha.1`. Closes #474.

Closes #484.

bigeasy/compassion