Update free-courses-vi.md (#4937)

* Update free-courses-vi.md

* Update free-courses-vi.md

Co-authored-by: Seth <seth@elypia.org>

Co-authored-by: Seth <seth@elypia.org>

free-courses-vi.md

@@ -115,6 +115,7 @@
 ### Go
 
 * [Golang Cơ Bản](https://www.codehub.com.vn/Golang-Co-Ban)
+* [Lập trình Golang](https://www.youtube.com/playlist?list=PLVDJsRQrTUz5icsxSfKdymhghOtLNFn-k) - Code4Func
 
 
 ### HTML