Update funding

Add link to open collective

Author: Relequestual

.github/FUNDING.yml

@@ -2,7 +2,7 @@
 
 github: # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
 patreon: # Replace with a single Patreon username
-open_collective: # Replace with a single Open Collective username
+open_collective: json-schema
 ko_fi: relequestual
 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