Update FUNDING.yml

Author: dai-shi

.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://daishi.gumroad.com/l/uaxms'] # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']
+custom: ['https://daishi.gumroad.com/l/uaxms', 'https://daishi.gumroad.com/l/learn-zustand-v4'] # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']