Separate items with line after every Items on the order email

Hi
I have done the instructions on the following link to make a line after every item on the order email.
I just paste the code

echo “\r\n”;
echo “——————————”;
echo “\r\n”;

on the bottom of the woocommerce/templates/emails/plain/email-order-details.php
But it doesn’t make any change.

Also I paste this code after
35 `echo “==========\n\n”;
But no change.

This is the code lists on my php.

35 `echo “==========\n\n”;
36 $item_totals = $order->get_order_item_totals();
37
38 if ( $item_totals ) {
39 foreach ( $item_totals as $total ) {

So which code I need add to get the items on the order email needs to be separated with lines .
Please help me regarding this.

Thanks

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