itemList(items) {
		return items.reduce((a, item) => a + `
<li data-id="${item.id}"${item.completed ? ' class="completed"' : ''}>
	<div class="view">
		<input class="toggle" type="checkbox" ${item.completed ? 'checked' : ''}>
		<label>${escapeForHTML(item.title)}</label>
		<button class="destroy"></button>
	</div>
</li>`, '');
	}
Format the contents of a todo list.

@param {ItemList} items Object containing keys you want to find in the template to replace.
@returns {!string} Contents for a todo list

@example
view.show({
	id: 1,
	title: "Hello World",
	completed: false,
})