Merge pull request #5 from pusher/release/0.2.1

Update the CHANGELOG file for v0.2.1 release

CHANGELOG.md

@@ -4,7 +4,17 @@ 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](https://github.com/pusher/NWWebSocket/compare/0.2.0...HEAD)
+## [Unreleased](https://github.com/pusher/NWWebSocket/compare/0.2.1...HEAD)
+
+## [0.2.1](https://github.com/pusher/NWWebSocket/compare/0.2.0...0.2.1) - 2020-10-16
+
+### Added
+
+- This CHANGELOG file.
+
+### Changed
+
+- `NWWebSocket` class (and some methods) are now defined as `open` (previously they were `public`).
 
 ## [0.2.0](https://github.com/pusher/NWWebSocket/compare/0.1.0...0.2.0) - 2020-10-15