docs: added ActivityWatch org to FUNDING.yml

Author: ErikBjare

.github/FUNDING.yml

@@ -1,7 +1,7 @@
 # Docs for this file can be found here:
 # https://docs.github.com/en/github/administering-a-repository/displaying-a-sponsor-button-in-your-repository
 
-github: ["ErikBjare", "johan-bjareholt"]
+github: ["ActivityWatch", "ErikBjare", "johan-bjareholt"]
 patreon: "erikbjare"
 open_collective: "activitywatch"
 liberapay: "ActivityWatch"