Update README.md

README.md

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 ZMarkupParser is a pure-Swift library that helps you convert HTML strings into NSAttributedString with customized styles and tags.
 
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 ## Technical Details:
 - \[Chinese\] [Development Notes](https://medium.com/zrealm-ios-dev/zmarkupparser-html-string-%E8%BD%89%E6%8F%9B-nsattributedstring-%E5%B7%A5%E5%85%B7-a5643de271e4)
 - \[English\] [Development Notes (translated using ChatGPT)](https://en.zhgchg.li/posts/2724f02f6e7/)
@@ -27,6 +25,12 @@ ZMarkupParser is a pure-Swift library that helps you convert HTML strings into N
 - [x] Better performance compared to `NSAttributedString.DocumentType.html`.
 - [x] Fully test cases and test coverage.
 
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+<a href="https://www.buymeacoffee.com/zhgchgli" target="_blank"><img width="545" alt="bmc-button" src="https://github.com/user-attachments/assets/5983bfc9-27fd-49e0-a7f4-eb07657c6e31"></a>
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+[**If this project has helped you, feel free to sponsor me a cup of coffee, thank you.**](https://www.buymeacoffee.com/zhgchgli)
+
 ## Try it!
 
 ![Simulator Screen Recording - iPhone 14 Pro - 2023-03-09 at 23 38 25](https://user-images.githubusercontent.com/33706588/224075106-6a335e38-3f9c-4e1a-aee4-0414a96f2a65.gif)