Merge pull request #9 from bwplotka/release-0.1

Added CHANGELOG: Cut release v0.9.0.

Author: bwplotka

CHANGELOG.md

@@ -0,0 +1,16 @@
+# 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).
+
+NOTE: As semantic versioning states all 0.y.z releases can contain breaking changes in API (flags, grpc API, any backward compatibility)
+
+We use *breaking* word for marking changes that are not backward compatible (relates only to v0.y.z releases.)
+
+## [v0.9.0](https://github.com/bwplotka/flagarize/releases/tag/v0.9.0) - 2020.03.22
+
+Initial release 💪💪 💪
+
+Why 0.9.0? Well, because we plan to release 1.0 once we introduce this library to [Thanos](http://github.com/thanos-io/thanos) as the final test (: