Update README.md

Blue-Crescent · Feb 13, 2024 · ba9412f · ba9412f
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@@ -148,7 +148,7 @@ void loop() {
 
 # 動作Demo
 
-[![Youtube](img/youtube_thumb.png))([https://youtu.be/QVjbMRq6WlM)]
+[![](https://img.youtube.com/vi/QVjbMRq6WlM/0.jpg)](https://www.youtube.com/watch?v=QVjbMRq6WlM)
 
 
 ## サンプルスケッチ