Update README.md

README.md

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   <img src="https://github.com/VirtualPlanetaryLaboratory/vplanet/actions/workflows/docs.yml/badge.svg"></a>
   <a href="https://ui.adsabs.harvard.edu/abs/2019arXiv190506367B/abstract"><img src="https://img.shields.io/badge/Read-the_paper-darkgreen.svg?style=flat"></a>
   <a href="https://VirtualPlanetaryLaboratory.github.io/vplanet/conduct.html"><img src="https://img.shields.io/badge/Code%20of-Conduct-7d93c7.svg"></a>
-  <a href="http://twitter.com/VPLanetCode"><img src="https://img.shields.io/twitter/follow/VPLanetCode.svg?style=flat-square&logo=twitter&label=Follow"></a><br>
+  <a href="https://www.youtube.com/channel/UCyb44vpUvEDId2Y08T7ePRwe"><img src="https://img.shields.io/badge/You-Tube-darkred.svg"></a><br>
   <img src="https://img.shields.io/badge/Unit%20Tests-14,440-darkblue.svg"></a>
   <a href="https://github.com/VirtualPlanetaryLaboratory/vplanet/actions/workflows/tests.yml">
   <img src="https://github.com/VirtualPlanetaryLaboratory/vplanet/actions/workflows/tests.yml/badge.svg"></a>