Round the subtotal before apply discount in cart for cart rules

Round subtotal before applying cart discounts for cart rules.

function woo_discount_rules_before_calculate_discount_from_subtotal_in_cart_method($subtotal, $discount_type){
	if(function_exists('wc_round_discount')){
		$subtotal = wc_round_discount($subtotal, 0);
	}
	return $subtotal;
}
add_filter('woo_discount_rules_before_calculate_discount_from_subtotal_in_cart', 'woo_discount_rules_before_calculate_discount_from_subtotal_in_cart_method', 10, 2);