Updated README

Author: Paul Crane

README.md

@@ -152,7 +152,7 @@ export default class SimpleControlledFullExample extends React.Component<{}, Sta
 | `onResize`           |          |<code>(e: MouseEvent &#124; TouchEvent, key: string, dir: PaneResizeDirection, elementRef: HTMLElement, delta: PaneSize) => void</code>| `undefined`          | It is called when `Pane` component resize.                                                                                                                           |
 | `onResizeStop`       |          |<code>(e: MouseEvent &#124; TouchEvent, key: string, dir: PaneResizeDirection, elementRef: HTMLElement, delta: PaneSize) => void</code>| `undefined`          | It is called when `Pane` component resize stop.                                                                                                                      |
 | `onDragStart`        |          |<code>(e: React.MouseEvent<HTMLElement> &#124; React.TouchEvent<HTMLElement>,  key: string, elementRef: HTMLElement) => void</code>    | `undefined`          | It is called when `Pane` component dragging starts.                                                                                                                  |
-| `onDragStop`         |          |<code>(e: MouseEvent &#124; TouchEvent, key: PaneKey, elementRef: HTMLElement) => void</code>                                          | `undefined`          | It is called when `Pane` component dragging stop.                                                                                                                    |
+| `onDragStop`         |          |<code>(e: MouseEvent &#124; TouchEvent, key: PaneKey, elementRef: HTMLElement, order: string[]) => void</code>                                          | `undefined`          | It is called when `Pane` component dragging stop.                                                                                                                    |
 
 ## PaneComponent