Update README.md

Author: adamgraham

README.md

@@ -5,4 +5,4 @@
 - **Topics**: Game Logic, Tilemaps, Grids
 - **Version**: Unity 2020.3 (LTS)
 - [**Download**](https://github.com/zigurous/unity-tetris-tutorial/archive/refs/heads/main.zip)
-- [**Tutorial Video**](https://youtu.be/ODLzYI4d-J8)
+- [**Watch Video**](https://youtu.be/ODLzYI4d-J8)