Update FUNDING.yml

Author: WangNingkai

.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://www.paypal.me/wangningkai, https://pay.ningkai.wang]
+custom: [https://www.paypal.me/wangningkai,https://pay.ningkai.wang]