Trigger netrw autocommand when opening directory

by @wilywampa
https://github.com/junegunn/fzf/pull/371

autoload/fzf/vim.vim

@@ -87,6 +87,9 @@ function! s:common_sink(lines) abort
     set noautochdir
     for item in a:lines
       execute cmd s:escape(item)
+      if exists('#BufEnter') && isdirectory(item)
+        doautocmd BufEnter
+      endif
     endfor
   finally
     let &autochdir = autochdir