Update CONTRIBUTING.md

TommyLemon · web-flow · commit f7a05907de2c · 2021-09-02T11:15:56.000+08:00
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -115,6 +115,7 @@ $ git remote add APIJSON git@github.com:Tencent/APIJSON.git
 #### 保持与 APIJSON 仓库的同步
 
 直接在 fork Repo 的首页点 Contribute > Open pull request
+
 ![image](https://user-images.githubusercontent.com/5738175/131775861-15a2bf9e-4e85-4588-bd2d-f9d78b76541c.png)
 
 或者
