docs: update changelog

Author: zhensherlock

CHANGELOG.md

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+## [1.6.3](https://github.com/zhensherlock/watermark-js-plus/compare/v1.6.2...v1.6.3) (2025-07-25)
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+### 🐛 Bug Fixes | Bug 修复
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+* change animation timing function to linear for consistency ([27e1ecb](https://github.com/zhensherlock/watermark-js-plus/commit/27e1ecbe13d8de135a05ae3b1646b42bfd456bb2))
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 ## [1.6.2](https://github.com/zhensherlock/watermark-js-plus/compare/v1.6.1...v1.6.2) (2025-05-13)