Update FUNDING.yml

Author: Xerolux

.github/FUNDING.yml

@@ -1,6 +1,7 @@
 # These are supported funding model platforms
 
 github: xerolux
+custom: https://ts.la/sebastian564489
 patreon: Xerolux # Replace with a single Patreon username
 open_collective: # Replace with a single Open Collective username
 ko_fi: xerolux # Replace with a single Ko-fi username