No issue: add CHANGELOG, including 0.2.0 and old releases.

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.2.0] - 2018-07-28
+### Added
+- Hoist Bugzilla links to top of issues page
+
+### Changed
+- Renamed to APT GitHub Improvements: it is simpler to maintain in one addon
+and it's easier for the APT team to get new updates in one add-on.
+  - Code for previous releases can be found at https://github.com/mcomella/github-story-points
+- Requires `bugzilla.mozilla.org/rest` webRequest permission
+- Relicensed from X11 to MPLv2
+
+## [0.1.0] - 2018-05-30
+
+### Added
+- "Unlabeled" and "multiple label" counts
+
+### Removed
+- Unused api.github.com permission
+
+## [0.0.1] - 2018-05-12
+### Added
+- Released as GitHub Story Points on addons.mozilla.org.
+- Count the number of size S, M, and L labels