Update funding.yml

Author: Scrum

.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: ['paypal.me/scrumpay']
+custom: ['https://paypal.me/scrumpay']