Update FUNDING.yml

.github/FUNDING.yml

@@ -6,4 +6,4 @@ open_collective: # Replace with a single Open Collective username
 ko_fi: # Replace with a single Ko-fi username
 tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
 community_bridge: # Replace with a single Community Bridge project-name e.g., cloud-foundry
-other: https://www.paypal.me/dgibbs64 # Replace with a single custom sponsorship URL
+custom: https://www.paypal.me/dgibbs64 # Replace with a single custom sponsorship URL