Use new way to register mcl skin

init.lua

@@ -4,13 +4,10 @@ local mcl_skins_enabled = minetest.settings:get_bool("mcl_enable_skin_customizat
 
 local function process_skin(skin)
   local name  = skin.texture .. ".png"
-
-  local num = #mcl_skins.simple_skins;
-
-  mcl_skins.simple_skins[num + 1] = {
+  mcl_skins.register_simple_skin({
     texture = name,
     slim_arms = skin and skin.gender == "female",
-  }
+  })
 end
 
 local function init_simple_skins()