📚 Add CHANGELOG.md

Author: heppokofrontend

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
+
+- The test of `value` props
+- The test of `textContent` props
+
+## [1.1.0] - 2021-09-06
+
+### Fixed
+
+- Fix a few code according to the coding rules.
+- Fix the bug of ignoring `null` when the `value` of `label` and `language`  are empty.
+
+### Added
+
+- [CHANGELOG.md](CHANGELOG.md)
+- Support to edit by `textContent` propperty
+- Support to use in React
+
+### Update
+
+- Reduce the number of unnecessary calls of `#render`
+
+### Remove
+
+- The test of `value` props
+- The test of `textContent` props
+
+## [1.0.7] - 2021-09-05
+
+### Fixed
+
+- README.md
+
+## [1.0.6] - 2021-08-08
+
+### Update
+
+- README.md
+
+## [1.0.5] - 2021-08-08
+
+### Update
+
+- README.md
+
+## [1.0.4] - 2021-08-08
+
+### Added
+
+- bower.json
+
+## [1.0.3] - 2021-08-02
+
+### Fixed
+
+- main prop in package.json
+
+## [1.0.1] - 2021-08-02
+
+### Fixed
+
+- main prop in package.json
+
+## [1.0.0] - 2021-08-02
+
+### Added
+
+- Linter
+- Test
+
+## [0.2.1] - 2021-08-01
+
+### Fixed
+
+- Handling blank lines
+
+## [0.2.0] - 2021-08-01
+
+### Added
+
+- Copy button
+
+## [0.1.0] - 2021-08-01
+
+### Added
+
+- The `label` attribute
+
+### Update
+
+- Default style
+- Refactoring
+
+## [0.0.1] - 2021-07-31
+
+### Added
+
+- First release
+
+[1.1.0]: https://github.com/heppokofrontend/html-code-block-element/releases/tag/v1.1.0
+[1.0.7]: https://github.com/heppokofrontend/html-code-block-element/releases/tag/v1.0.7
+[1.0.6]: https://github.com/heppokofrontend/html-code-block-element/releases/tag/v1.0.6
+[1.0.5]: https://github.com/heppokofrontend/html-code-block-element/releases/tag/v1.0.5
+[1.0.4]: https://github.com/heppokofrontend/html-code-block-element/releases/tag/v1.0.4
+[1.0.3]: https://github.com/heppokofrontend/html-code-block-element/releases/tag/v1.0.3
+[1.0.1]: https://github.com/heppokofrontend/html-code-block-element/releases/tag/v1.0.1
+[1.0.0]: https://github.com/heppokofrontend/html-code-block-element/releases/tag/v1.0.0
+[0.2.1]: https://github.com/heppokofrontend/html-code-block-element/releases/tag/v0.2.1
+[0.2.0]: https://github.com/heppokofrontend/html-code-block-element/releases/tag/v0.2.0
+[0.1.0]: https://github.com/heppokofrontend/html-code-block-element/releases/tag/v0.1.0
+[0.0.1]: https://github.com/heppokofrontend/html-code-block-element/releases/tag/v0.0.1