Add a translation link for Vietnamese

Author: hprobotic

README.md

@@ -1,7 +1,7 @@
 ## git-tips
 > Collection of `git-tips`, want to add your tips? Checkout [contributing.md](./contributing.md)
 
-[English](http://git.io/git-tips) | [中文](https://github.com/521xueweihan/git-tips) | [Русский](https://github.com/Imangazaliev/git-tips) | [한국어](https://github.com/mingrammer/git-tips)
+[English](http://git.io/git-tips) | [中文](https://github.com/521xueweihan/git-tips) | [Русский](https://github.com/Imangazaliev/git-tips) | [한국어](https://github.com/mingrammer/git-tips) | [Tiếng Việt](https://github.com/hprobotic/git-tips)
 
 ### __Tools:__