Update FUNDING.yml

Author: bluejoe2008

.github/FUNDING.yml

@@ -9,4 +9,4 @@ community_bridge: # Replace with a single Community Bridge project-name e.g., cl
 liberapay: # Replace with a single Liberapay username
 issuehunt: # Replace with a single IssueHunt username
 otechie: # Replace with a single Otechie username
-custom: https://bluejoe2008.github.io/pay.png
+custom: https://bluejoe2008.github.io/open-source-sponser.png