update readme.md

2022-03-16 17:37:18 +08:00 · 2022-03-16 17:37:18 +08:00 · 8d81a3b021
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--- a/zh-CN/src/why-exercise.md
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+<h1 align="center">Rust语言实战</h1>
+
 <div align="center">
    <img height="150" src="https://github.com/sunface/rust-by-practice/blob/master/assets/logo.png?raw=true">
 </div>