Update FUNDING.

Author: chengpeiquan

.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://github.com/chengpeiquan/sponsor
+custom: [chengpeiquan](https://github.com/chengpeiquan/sponsor)