Update README.md

Author: donaldzou

README.md

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 ## 📣 What's New: v4.0
 
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+> [📹 Demo video on YouTube](https://www.youtube.com/watch?v=0mwzd5Gr2eU)
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 ### 🎉 New Features
 
 - **Updated dashboard design**: Re-designed some of the section with more modern style and layout, the UI is faster and more responsive, it also uses less memory. But overall is still the same dashboard you're familiarized.
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 > Also, huge thanks to who contributed to this major release:
 > @bolgovrussia, @eduardorosabales, @Profik, @airgapper, @tokon2000, @bkeenke, @kontorskiy777, @bugsse, @Johnnykson, @DaanSelen, @shuricksumy and many others!
 
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 ## 📋  Table of Content