add changelog

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).
+
+## [Unreleased]
+
+## [v0.3.0]
+
+### Added
+- Support for Windows via [MSYS2](https://www.msys2.org/). Thanks to [@neptoess](https://github.com/neptoess)
+
+### Changed
+- Upgraded V8 to 8.7.220.31
+
+## [v0.2.0] - 2020-01-25
+
+### Added
+- Manually dispose of the isolate when required
+- Monitor isolate heap statistics. Thanks to [@mehrdadrad](https://github.com/mehrdadrad)
+
+### Changed
+- Upgrade V8 to 8.0.426.15
+
+## [v0.1.0] - 2019-09-22
+
+### Changed
+- Upgrade V8 to 7.7.299.9
+
+## [v0.0.1] - 2019-09-2020
+
+### Added
+- Create V8 Isolate
+- Create Contexts
+- Run JavaScript scripts
+- Get Values back from JavaScript in Go
+- Get detailed JavaScript errors in Go, including stack traces
+- Terminate long running scripts from any Goroutine