Update README.md (#817)

#### What this PR does / why we need it?

#### Summary of your change

#### Please indicate you've done the following:

- [ ] Made sure tests are passing and test coverage is added if needed.
- [ ] Made sure commit message follow the rule of [Conventional Commits specification](https://www.conventionalcommits.org/).
- [ ] Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

README.md

@@ -43,7 +43,7 @@ curl -sSL https://resource.fit2cloud.com/1panel/package/quick_start.sh -o quick_
 - [教学视频](https://space.bilibili.com/510493147/channel/collectiondetail?sid=1199760)
 - [社区论坛](https://bbs.fit2cloud.com/c/1p/7)
 
-## 微信交流群
+**加入微信交流群**
 
 <img src="https://1panel.cn/img/wechat-group.jpg" width="156" height="156"/>