add changelog

Author: rhysd

CHANGELOG.md

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+<a name="v4.0.0"></a>
+# [v4.0.0](https://github.com/rhysd/remark-emoji/releases/tag/v4.0.0) - 10 Aug 2023
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+- **Breaking Change** Update [node-emoji](https://www.npmjs.com/package/node-emoji) from v1 to v2. This change introduces support for many new emojis and removes old emoji short codes which are no longer valid on GitHub.
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+[Changes][v4.0.0]
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+
+[v4.0.0]: https://github.com/rhysd/remark-emoji/tree/v4.0.0
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+<!-- Generated by https://github.com/rhysd/changelog-from-release v3.7.0 -->