Added Changelog

Author: sea5kg

CHANGELOG.md

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+# Changelog
+
+All notable changes to wsjcpp-hashes 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/).
+
+## [v0.1.2] - 2020-09-12 (2020 Sep 12)
+
+### Security
+
+- Fixed alerts by lgtm
+