Add Changelog

Author: jrfnl

CHANGELOG.md

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+# Change Log for Yoast WP Test Utils
+
+All notable changes to this project will be documented in this file.
+
+This projects adheres to [Keep a CHANGELOG](http://keepachangelog.com/) and uses [Semantic Versioning](http://semver.org/).
+
+
+## [Unreleased]
+
+_Nothing yet._
+
+
+## [0.1.0] - 2020-11-13
+
+Initial release.
+
+
+[Unreleased]: https://github.com/Yoast/wp-test-utils/compare/0.1.0...HEAD
+[0.1.0]: https://github.com/Yoast/wp-test-utils/compare/35bd47e4d59568ee0bf0997b49111c6fd0da7a8e...0.1.0