Add a changelog

Author: rictic

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## Unreleased
+
+<!-- New PRs should document their changes here. -->
+
+## [0.0.5] - 2016-09-15
+
+### Changed
+* Left-align time bars
+* Use a sourceURL to clarify the source of the injected code.
+* Draw a table with in-cell bar charts to quickly visualize where the work is going.
+
+### Fixed
+* Updated CSS parser to fix several parse bugs. See https://github.com/PolymerLabs/shady-css-parser/releases/tag/v0.0.8
+
+## [0.0.4] - 2016-09-14
+
+### Added
+* Add ability to reset stats.
+
+## [0.0.3] - 2016-09-09
+
+### Added
+* Track and display Polymer data-binding time.
+* Misc improvements to tracking and visualization.