Create CHANGELOG.md

Author: Xing

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](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.0.1]
+### Added
+* Up-to-date [Contributing instructions](https://github.com/plotly/dash-pivottable/blob/master/CONTRIBUTING.md)
+* Up-to-date Readme
+* Issue and PR templates
+* [Dash testing](https://dash.plotly.com/testing) with Pytest fixtures
+* CircleCI deployment and Percy Snapshots
+* Create package-lock.json instead of yarn.lock
+* Up-to-date [license](https://github.com/plotly/dash-pivottable/blob/master/LICENSE)
+* Up-to-date `setup.py`