"disabled" option of plugin is not working

[ab-pm]

The draft-js-checkable-list-plugin decorates the <CheckableListItem> with a disabled prop, yet that doesn't actually take such a prop:

draft-js-checkable-list-item/src/CheckableListItem.js

Lines 14 to 27 in 9f40911

	type Props = {
	contentState: ContentState,
	block: ContentBlock,
	customStyleMap: Object,
	customStyleFn: Function,
	tree: List<any>,
	selection: SelectionState,
	decorator: DraftDecoratorType,
	forceSelection: boolean,
	direction: BidiDirection,
	blockStyleFn: Function,
	offsetKey: string,
	blockProps: BlockProps,
	}

Please add support for this, it would be very useful for usage with a readonly editor. It would be even greater if the readonly editor prop value could be used as a default for this :-)