Merge pull request #6 from MarcL/feature/add-changelog

Add CHANGELOG

Author: MarcL

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).
+
+## [2.0.0] - 2017-07-11
+### Added
+- Allow `ItemSearch` to be sorted by value
+
+### Change
+- Defaults to using HTTPS endpoint rather than HTTP
+
+## [1.0.0] - 2017-07-11
+### Added
+- Initial version since 2012
+