doc: update README

Former-commit-id: bad31c6

README.md

@@ -9,7 +9,7 @@ Markdown 的轻量化特性，使您可以专注于论文内容而不用担心
 
 If you are not studying in China, please DO NOT use this theme. Instead, you could check another theme: [Paper – A typora theme using latex fonts to be used in academic work](https://theme.typora.io/theme/paper/).
 
-![GitHub downloads](https://img.shields.io/github/downloads/Keldos-Li/typora-latex-theme/total?logo=data:image/png;base64,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)
+<a href="https://github.com/Keldos-Li/typora-latex-theme/releases">![GitHub downloads](https://img.shields.io/github/downloads/Keldos-Li/typora-latex-theme/total?logo=data:image/png;base64,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)</a>
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