Update plug.vim

Author: junegunn

plug.vim

@@ -392,7 +392,7 @@ function! plug#end()
         augroup filetypedetect
         call s:source(s:rtp(plug), 'ftdetect/**/*.vim', 'after/ftdetect/**/*.vim')
         if has('nvim-0.5.0')
-            call s:source(s:rtp(plug), 'ftdetect/**/*.lua', 'after/ftdetect/**/*.lua')
+          call s:source(s:rtp(plug), 'ftdetect/**/*.lua', 'after/ftdetect/**/*.lua')
         endif
         augroup END
       endif