First go at a change log

Author: jarofgreen

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).
+
+## [Unreleased]
+
+## [0.1.2] - 2018-06-28
+
+(As there are new features, this should have been a minor release. Just noting so we pick this up for future releases.)
+
+(This release was documented after the release and some things may have been missed.)
+
+### Added
+
+- Support user-defined XML root node https://github.com/OpenDataServices/flatten-tool/pull/201
+- Require lxml https://github.com/OpenDataServices/flatten-tool/pull/207
+
+### Fixed
+
+- Add missing comma to CSV fixture https://github.com/OpenDataServices/flatten-tool/pull/203
+- Do not hardcode iati-activities for top level for all xml https://github.com/OpenDataServices/flatten-tool/issues/150
+- Don't split text value of xml array https://github.com/OpenDataServices/flatten-tool/pull/208
+
+## [0.1.1] - 2018-03-28
+
+Initial Release.