Update course.yml

_data/course.yml

@@ -28,7 +28,7 @@ signups:
    image: https://pbs.twimg.com/profile_images/514798020592807937/q_jllsGm_400x400.png
    twitter: jalbertbowdenii
  - name: Tim Gaudette
-   image: https://pbs.twimg.com/profile_images/450785510252765184/0Z5NyUcr_normal.jpeg
+   image: https://pbs.twimg.com/profile_images/540664806982696960/W9EIC_Yq.jpeg
    twitter: gaudettetim
  - name: Phillip Davis
    image: https://media.licdn.com/media/p/1/000/195/005/1f87723.jpg