feat: reload explorer on buf enter (#1265)

doc/nvim-tree-lua.txt

@@ -96,6 +96,7 @@ Values may be functions. Warning: this may result in unexpected behaviour.
       open_on_tab = false,
       sort_by = "name",
       update_cwd = false,
+      reload_on_bufenter = false,
       view = {
         width = 30,
         height = 30,
@@ -263,6 +264,10 @@ Keeps the cursor on the first letter of the filename when moving in the tree.
 Changes the tree root directory on `DirChanged` and refreshes the tree.
   Type: `boolean`, Default: `false`
 
+*nvim-tree.reload_on_bufenter*
+Automatically reloads the tree on `BufEnter` nvim-tree.
+  Type: `boolean`, Default: `false`
+
 *nvim-tree.hijack_directories*
 hijacks new directory buffers when they are opened (`:e dir`).