Added CHANGELOG

Author: devgianlu

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).
+
+## [1.1.0] - 13-12-2019
+### Added
+- Websocet API to listen to player events
+- Ability to change the API port via `api.port`
+- Retry request when Spotify sends 503
+
+### Changed
+- Fixed deadlocks
+- Fixed synchronization issue