Update Ultralytics YouTube URL

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Enhanced YouTube link for streamlined user subscription experience.

📊 Key Changes

• Updated the YouTube link in the README to include a ?sub_confirmation=1 parameter.

🎯 Purpose & Impact

• Easier Subscriptions: The change aims to make it simpler and more intuitive for users to subscribe to the Ultralytics YouTube channel. By clicking on the updated link, users will be directly prompted to subscribe, thereby improving user experience and potentially increasing the subscription rate.
• Increased Engagement: With a more straightforward path to subscribing, this update may lead to higher engagement on Ultralytics' YouTube content, fostering a more active and engaged community.

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