chore(FUNDING): add ko-fi

Signed-off-by: Rongrong <[email protected]>

.github/FUNDING.yml

@@ -3,7 +3,7 @@
 github: Rongronggg9
 patreon: rongbot
 open_collective: # Replace with a single Open Collective username
-ko_fi: # Replace with a single Ko-fi username
+ko_fi: rongbot
 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