Create CHANGELOG.md

Author: pkarw

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).
+
+## [1.8.1] - 2019.02.11
+- Fixed `apiVersion` property for ElasticSearch driver - now it's available thru `config/*.json` - @mdanilowicz (#185)