chore: update sponsor way

Author: SWHL

.github/FUNDING.yml

@@ -10,4 +10,5 @@ liberapay: # Replace with a single Liberapay username
 issuehunt: # Replace with a single IssueHunt username
 otechie: # Replace with a single Otechie username
 lfx_crowdfunding: # Replace with a single LFX Crowdfunding project-name e.g., cloud-foundry
-custom: https://rapidai.github.io/RapidOCRDocs/main/sponsor/
+buy_me_a_coffee: swhl
+custom: https://rapidai.github.io/RapidOCRDocs/main/sponsor/