add CHANGELOG.md (#10)

.github/pull_request_template.md

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+- [ ] update `CHANGELOG.md`

.yaspellerrc

@@ -1,6 +1,13 @@
 {
 	"lang": "en",
+	"ignoreCapitalization": true,
 	"dictionary": [
-		"mixins"
+		"Changelog",
+		"ES",
+		"Unreleased",
+		"Versioning",
+		"devDependencies",
+		"mixins",
+		"peerDependencies"
 	]
 }

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]
+### Added
+- Added [lint-staged](https://github.com/okonet/lint-staged).
+- Added spell checking for `*.md` files. [#9](https://github.com/dvpnt/styled-media-helper/pull/9).
+
+### Changed
+- Updated `README.md`.
+- Rewrote to ES modules.
+- Updated devDependencies.
+- Updated peerDependencies.
+
+## [2.0.2] - 2020-04-06
+### Changed
+- Updated devDependencies.
+
+## [2.0.1] - 2020-03-16
+### Added
+- Added `keywords` field to `package.json`.
+
+### Changed
+- Updated devDependencies.
+
+## [2.0.0] - 2019-11-18
+### Changed
+- Changed usage API. [#7](https://github.com/dvpnt/styled-media-helper/pull/7)
+- Updated `README.md`.
+- Updated devDependencies.
+
+## [1.1.0] - 2019-03-06
+### Changed
+- Updated devDependencies.
+- Updated peerDependencies.
+
+## [1.0.1] - 2018-10-09
+### Added
+- Added `repository` field to `package.json`.
+
+## [1.0.0] - 2018-10-09
+
+[Unreleased]: https://github.com/dvpnt/styled-media-helper/compare/v2.0.2...HEAD
+[2.0.2]: https://github.com/dvpnt/styled-media-helper/compare/v2.0.1...v2.0.2
+[2.0.1]: https://github.com/dvpnt/styled-media-helper/compare/v2.0.0...v2.0.1
+[2.0.0]: https://github.com/dvpnt/styled-media-helper/compare/v1.1.0...v2.0.0
+[1.1.0]: https://github.com/dvpnt/styled-media-helper/compare/v1.0.1...v1.1.0
+[1.0.1]: https://github.com/dvpnt/styled-media-helper/compare/v1.0.0...v1.0.1
+[1.0.0]: https://github.com/dvpnt/styled-media-helper/releases/tag/v1.0.0