Release Strata version 2.0.0-alpha.77.
Release Strata version 2.0.0-alpha.77.

 * Use new `Deferrable.copacetic()`.
 * Upgrade `writeahead` to `0.0.9`.
 * Upgrade `turnstile` to `6.0.0-alpha.46`.
 * Upgrade `destructible` to `7.0.0-alpha.33`.
 * Upgrade `fracture` to `0.3.0-alpha.29`.
 * Update for new background write-ahead log.

Closes #746.

bigeasy/strata,bigeasy/strata