update changelog for v0.2.0

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).
+
+
+
+## [v0.2.0](https://github.com/rokucommunity/roku-promise/compare/v0.1.0...v0.2.0) - 2021-10-25
+### Added
+ - new function `createResolvedPromise()` ([#9](https://github.com/rokucommunity/roku-promise/pull/9))
+### Changed
+ - made `createPromiseFromNode()` public ([#9](https://github.com/rokucommunity/roku-promise/pull/9))
+### Fixed
+ - issues in `dispose()` logic ([#9](https://github.com/rokucommunity/roku-promise/pull/9))
+
+
+
+## [v0.1.0](https://github.com/rokucommunity/roku-promise/compare/84f88abf9c2e23086c9067820f6da7258fe97af5...v0.1.0) - 2020-10-17
+### Added
+ - initial release
+