Update FUNDING.yml

Author: khmyznikov

.github/FUNDING.yml

@@ -10,4 +10,4 @@ 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://paypal.me/hmyznikov']
+custom: ['https://paypal.me/hmyznikov', 'https://www.buymeacoffee.com/khmyznikov']