Added CHANGELOG.md

Author: tgeens

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](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## _Unreleased_
+
+## 0.2.0 - 2021-07-20
+
+Changed:
+* Moved maven group coordinates to `eu.xenit.contentcloud.thunx`
+* Change OPA term `Numeric` parameterized type from `Number` to `BigDecimal`
+* Make http-log-spec configurable from `OpaClient.Builder`
+
+Fixed:
+* Fixes OPA terms equality checks
+
+## 0.1.0 - 2021-05-26
+
+Added:
+- Initial release