Add CHANGELOG.md

Author: pitchum

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).
+
+## Unreleasead
+
+- CAS authentication
+
+## 0.1 - 2018-12-19
+
+Forking from Edraens/EdPaste