Update Ultralytics YouTube URL

Author: glenn-jocher

README.md

@@ -43,6 +43,7 @@ Ultralytics is excited to offer two different licensing options to meet your nee
 
 For bug reports, feature requests, and contributions, head to [GitHub Issues](https://github.com/ultralytics/JSON2YOLO/issues). For questions and discussions about this project and other Ultralytics endeavors, join us on [Discord](https://ultralytics.com/discord)!
 
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   <a href="https://github.com/ultralytics"><img src="https://github.com/ultralytics/assets/raw/main/social/logo-social-github.png" width="3%" alt="Ultralytics GitHub"></a>