Update README.md (#262)

Co-authored-by: Nguyen The Phuc Hiep <99666324+ntphiep-amable@users.noreply.github.com>

README.md

@@ -14,7 +14,7 @@ Translations:
 * [Русский](README_ru.md)
 * [Türkçe](README_tr.md)
 * [Italiano](README_it.md)
-* [Vietnamese](README_vi.md)
+* [Tiếng Việt](README_vi.md)
 * [Українська](README_ua.md)
 * [Indonesian](README_id.md)
 * [हिन्दी](README_hi.md)