fixed link

README.md

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 A simple snake game in the terminal. No third party libraries needed.
 
 ## Demo
-[![Video Title](https://img.youtube.com/vi/VIDEO_ID/0.jpg)](https://www.youtube.com/watch?v=_coOVAW9qa4)
+[![Video Title](https://img.youtube.com/vi/_coOVAW9qa4/0.jpg)](https://www.youtube.com/watch?v=_coOVAW9qa4)