Update README.md

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# 引用与指针那些事
# Reference and Pointer
## 关于作者
## About Author
![](../img/wechat.jpg)
@ -149,7 +148,7 @@ Let's write out the reference C + + code segment test2 for parameter passing
```c++
void test2(int& r)
{
r = 3; //赋值前无需判断reference是否为空
r = 3; // do not need to judge whether reference is null.
return;
}
```