Release Memento version 0.1.45.
Release Memento version 0.1.45.

 * Update for dependency upgrades.
 * Upgrade `avenue` to `0.6.17`.
 * Upgrade `b-tree` to `2.0.0-alpha.120`.
 * Upgrade `satiate` to `0.0.5`.
 * Upgrade `amalgamate` to `0.1.75`.
 * Upgrade `reciprocate` to `0.0.9`.

Closes #146.

bigeasy/memento