Update README

README.md

@@ -10,12 +10,11 @@
     <img src="https://stdf.design/assets/favicon_logo/android-chrome-512x512.png" alt="logo" width="120" height="auto" />
   </picture>
   <h1>S T D F</h1>
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     <a href="https://github.com/dufu1991/stdf/blob/main/README_en.md" target="_blank">English</a>
     <span> • </span>
     <a href="https://stdf.design?lang=zh_CN" target="_blank">网站</a>
-  </h4>
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+  </h3>
   
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