Merge pull request #146 from wilsonrljr/sponsor/pix_link

add pix link as custom link in funding.yml

.github/FUNDING.yml

@@ -9,4 +9,4 @@ community_bridge: # Replace with a single Community Bridge project-name e.g., cl
 liberapay: # Replace with a single Liberapay username
 issuehunt: # Replace with a single IssueHunt username
 otechie: # Replace with a single Otechie username
-custom: # Replace with up to 4 custom sponsorship URLs e.g., ['link1', 'link2']
+custom: https://sysidentpy.org/landing-page/sponsor/#how-to-become-a-sponsor