Update FUNDING.yml

Author: yugasun

.github/FUNDING.yml

@@ -9,4 +9,5 @@ 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://www.buymeacoffee.com/yugasun # Replace with a single custom sponsorship URL
+# Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']
+custom: ['https://github.com/yugasun/buy-me-a-coffee']