Update Ultralytics YouTube URL

[glenn-jocher]

🛠️ PR Summary

_{Made with ❤️ by Ultralytics Actions}

🌟 Summary

Improvement in YouTube Link Interactivity in README 📽️✨

📊 Key Changes

• Updated the YouTube link in the README document. The new link prompts users to subscribe to Ultralytics' YouTube channel automatically.

🎯 Purpose & Impact

• Ease of Use: This change simplifies the process for users and potential followers to subscribe to the Ultralytics YouTube channel, potentially increasing subscriber numbers. 🚀
• Engagement Boost: By facilitating direct subscriptions, it encourages more active engagement from the community with Ultralytics' video content. 🌐
• Potential for Growth: This minor yet impactful change could lead to increased visibility and growth of Ultralytics' YouTube audience. 📈