chore: update FUNDING

Author: antonreshetov

.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: ['paypal.me/antongithub', antonreshetov.gumroad.com/l/masscode]
+custom: ['paypal.me/antongithub', antonreshetov.gumroad.com/l/masscode-dev]