vault-0.3.0.4: CHANGELOG.md

## Changelog for the `vault` package

**0.3.0.4** — Bump upper version bound for the `base` dependency.

**0.3.0.3** — Bump upper version bound for the `base` dependency.

**0.3.0.2** — Fix tarball.

**0.3.0.1** — Use CPP to reduce code duplication.

**0.3.0.0**

* Split modules into Lazy and Strict variants, no default choice.
* Add Hashable instance to `Data.Unique.Really` for all implementations.