Change Vietnam language code in translation file name

README.md

@@ -1,18 +1,18 @@
 # Coding Interview University
 
-> I originally created this as a short to-do list of study topics for becoming a software engineer, 
+> I originally created this as a short to-do list of study topics for becoming a software engineer,
-> but it grew to the large list you see today. After going through this study plan, [I got hired 
+> but it grew to the large list you see today. After going through this study plan, [I got hired
-> as a Software Development Engineer at Amazon](https://startupnextdoor.com/ive-been-acquired-by-amazon/?src=ciu)! 
+> as a Software Development Engineer at Amazon](https://startupnextdoor.com/ive-been-acquired-by-amazon/?src=ciu)!
 > You probably won't have to study as much as I did. Anyway, everything you need is here.
 >
-> The items listed here will prepare you well for in an interview at just about any software company, 
+> The items listed here will prepare you well for in an interview at just about any software company,
 > including the giants: Amazon, Facebook, Google or Microsoft.
 >
 > *Best of luck to you!*
 
 Translations:
 - [中文版本](translations/README-cn.md)
-- [Tiếng Việt - Vietnamese](translations/README-vn.md)
+- [Tiếng Việt - Vietnamese](translations/README-vi.md)
 - translations in progress:
     - [Español](https://github.com/jwasham/coding-interview-university/issues/80)
     - [हिन्दी](https://github.com/jwasham/coding-interview-university/issues/81)