feat: add default autocmd to avoid warning messages

Author: lambdalisue

plugin/fall.vim

@@ -15,10 +15,15 @@ augroup fall_plugin
   autocmd! *
   autocmd User FallPickerEnter:* :
   autocmd User FallPickerLeave:* :
+  autocmd User FallCustomLoaded :
+  autocmd User FallCustomRecached :
+  autocmd User FallPreviewRendered:* :
 augroup END
 
 if !exists('g:fall_custom_path')
   let g:fall_custom_path = has('nvim')
         \ ? expand(join([stdpath('config'), 'fall', 'custom.ts'], s:sep))
         \ : expand(join([$HOME, '.vim', 'fall', 'custom.ts'], s:sep))
 endif
+
+