Update README.md

Author: Joseph Luce

system_design/README.md

@@ -4,8 +4,8 @@ Start here.
 
 ### YouTube suggestions
 I recommend checking this guy's channel (Success in Tech). I would actually avoid Tushar Roy's channel, the quality of system design isn't on par. Another possible channel is Gaurav Sen.
-https://www.youtube.com/channel/UC-vYrOAmtrx9sBzJAf3x_xw
-https://www.youtube.com/channel/UCRPMAqdtSgd0Ipeef7iFsKw
+- https://www.youtube.com/channel/UC-vYrOAmtrx9sBzJAf3x_xw
+- https://www.youtube.com/channel/UCRPMAqdtSgd0Ipeef7iFsKw
 
 ### Rest Api and HTTP
 - https://www.youtube.com/watch?v=rhTkRK53XdQ