readme: Update default close bindings

README.md

@@ -37,7 +37,7 @@ vim.g.symbols_outline = {
     show_relative_numbers = false,
     show_symbol_details = true,
     keymaps = { -- These keymaps can be a string or a table for multiple keys
-        close = "<Esc>",
+        close = {"<Esc>", "q"},
         goto_location = "<Cr>",
         focus_location = "o",
         hover_symbol = "<C-space>",