Create CHANGELOG.md

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/).
+
+## 1.0.0 2017-02-14
+
+First tagged release, starting at 1.0.0 since the project can be considered stable at this point.