Add CHANGELOG

Author: robkooper

CHANGELOG.md

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+# Change Log
+All notable changes to this 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/).
+
+## 2.0.3 - 2018-04-18
+
+### Added
+- push to pypi (can now do pip install pyclowder)
+
+### Changed
+- Now has onbuild version of pyclowder
+- release.sh will now tag images (e.g. this will be tagged 2.0.3 2.0 and 2)
+- RABBITMQ_URI is now set to amqp://guest:guest@rabbitmq/%2F to allow easy deployment
+  using docker-compose of clowder