Update FUNDING.yml: Now available and approved by GitHub

cf. https://github.com/sponsors/coderdojo-japan

Author: yasulab

.github/FUNDING.yml

@@ -1,12 +1,12 @@
 # These are supported funding model platforms
 
-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
-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
-liberapay:        # Replace with a single Liberapay username
-issuehunt:        # Replace with a single IssueHunt username
-otechie:          # Replace with a single Otechie username
-custom: ['https://coderdojo.jp/partnership']
+github: coderdojo-japan # 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
+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
+liberapay:              # Replace with a single Liberapay username
+issuehunt:              # Replace with a single IssueHunt username
+otechie:                # Replace with a single Otechie username
+custom:                 # Now approved by GitHub and no need to set this 'coderdojo.jp/partnership'