Update FUNDING.yml addin PayPal

Author: villares

.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://gumroad.com/villares#aunif'] # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']
+# Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']
+custom: ['https://gumroad.com/villares#aunif', 'https://www.paypal.com/donate/?hosted_button_id=5B4MZ78C9J724']