Keep a good Changelog

To make it easier for users and contributors to see precisely what notable changes have been made between each release (or version) of the project.

A simple example would be:

# Changelog
All notable changes to this project will be documented in this file.

## [Unreleased]

## [1.0.0] - 2017-06-20
### Added
- New visual identity by [@tylerfortune8](https://github.com/tylerfortune8).
- Version navigation.