shellmet-0.0.1: CHANGELOG.md

# Changelog

`shellmet` uses [PVP Versioning][1].
The changelog is available [on GitHub][2].

## 0.0.1 — Apr 9, 2019

* Generalise the type of the `$?` operator to allow returning values on
  shell-command failuires.

## 0.0.0

* Initially created.

[1]: https://pvp.haskell.org
[2]: https://github.com/kowainik/shellmet/releases