update image

Author: TairanHe

README.md

@@ -5,7 +5,7 @@ Official Implementation for [Agile But Safe: Learning Collision-Free High-Speed
 [Tairan He*](https://tairanhe.com/), [Chong Zhang*](https://zita-ch.github.io/), [Wenli Xiao](https://wenlixiao-cs.github.io/), [Guanqi He](https://guanqihe.github.io/), [Changliu Liu](https://www.cs.cmu.edu/~cliu6/), [Guanya Shi](https://www.gshi.me/)  
 
 <p align="center">
-  <img src="images/teaser.jpeg" width="80%"/>
+  <img src="Youtube-Cover[2M].png" width="80%"/>
 </p>
 ## TODO: