Added a changelog

CHANGELOG.md

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+Changelog
+=========
+
+All notable changes to this project are documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.2.0] - 2020-02-05
+
+- Fixed bug which affected OCFL objects with multiple copies of the same file
+- Added autoindex feature which allows directory-like views of contents of a path
+
+## [1.1.3] - 2019-11-11
+
+- Moved the licence query filter onto the solr proxy endpoint
+
+## [1.1.2] - 2019-11-04
+
+- Moved solr index feature into the master branch
+
+## [1.1.0] - 2019-09-06
+
+- Beta version of solr index
+
+## [1.0.5] - 2019-08-16
+
+- Allows switching versioning off so that only HEAD is served
+
+## [1.0.4] - 2019-08-16
+
+- Stable pairtree-only version