Update README.md

Author: fzhlee

README.md

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 ![image](images/GithubSwiftUICover2.png)<br/><br/>
-[<img width="50" src="images/USFlag.png"/>English Version](README_English.md)
+[<img width="30" src="images/USFlag.png"/>English Version](README_English.md)
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 **SwiftUI<br/>
 更好的应用，更少的代码。<br/>