Release Compassion version 2.0.0-alpha.6.
Release Compassion version 2.0.0-alpha.6.

 * Update for dependency updates.
 * Upgrade `fastify` to `3.14.1`.
 * Upgrade `kibitz` to `^3.0.0-alpha.11`.
 * Upgrade `reactor` to `^17.0.0-alpha.9`.
 * Upgrade `staccato` to `13.0.0-alpha.6`.
 * Upgrade `destructible` to `7.0.0-alpha.64`.
 * Upgrade `perhaps` to `0.0.10`.
 * Upgrade `cubbyhole` to `^4.0.4`.

Closes #494.

bigeasy/compassion