Added CHANGELOG.md (#22)

Author: HustonMmmavr

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]
+
+## [1.0.0] - 2019-11-28
+
+### Added
+
+- Basic functionality
+- Sharding key support
+- Integration tests
+- Luarock-based packaging
+- Gitlab CI integration