I went by this example to update.

/*
 * Copyright (c) 2018, TheStonedTurtle <https://github.com/TheStonedTurtle>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package net.runelite.client.plugins.stonedtracker;

import net.runelite.client.config.Config;
import net.runelite.client.config.ConfigGroup;
import net.runelite.client.config.ConfigItem;

@ConfigGroup("stonedtracker")
public interface StonedTrackerConfig extends Config
{
	@ConfigItem(
		position = 0,
		keyName = "hideUniques",
		name = "Hide uniques",
		description = "Hides unique items from the item breakdown"
	)
	default boolean hideUniques()
	{
		return true;
	}

	@ConfigItem(
		position = 1,
		keyName = "itemSortType",
		name = "Sort Items by",
		description = "Sorts items by the requested value inside the UI. (Doesn't effect session/box view)"
	)
	default ItemSortTypes itemSortType()
	{
		return ItemSortTypes.ALPHABETICAL;
	}

	@ConfigItem(
		position = 2,
		keyName = "itemBreakdown",
		name = "Breakdown individual items",
		description = "Toggles whether the Individual item UI should be used inside npc-specific tabs"
	)
	default boolean itemBreakdown()
	{
		return true;
	}

	@ConfigItem(
		position = 3,
		keyName = "bossButtons",
		name = "Show boss icons",
		description = "Toggles whether the selection screen will use the boss icons"
	)
	default boolean bossButtons()
	{
		return true;
	}
}