Update BACKERS.md

BACKERS.md

@@ -24,6 +24,12 @@ This is a list of all the people who are contributing financially to Panda3D.  I
 * Sam Edwards
 * Max Voss
 
+## Enthusiasts
+
+![Benefactors](https://opencollective.com/panda3d/tiers/enthusiast.svg?avatarHeight=48&width=600)
+
+* Eric Thomson
+
 ## Backers
 
 ![Backers](https://opencollective.com/panda3d/tiers/backer.svg?avatarHeight=48&width=600)