docs: update link to defaultGetHelperDimensions

Author: clauderic

README.md

@@ -118,7 +118,7 @@ There are already a number of great Drag & Drop libraries out there (for instanc
 | lockToContainerEdges              | Boolean                                                   | `false`                                                                                                        | You can lock movement of the sortable element to it's parent `SortableContainer`                                                                                                                                                                                                                                                                                                                                                                                       |
 | lockOffset                        | `OffsetValue`\* | [`OffsetValue`\*, `OffsetValue`\*] | `"50%"`                                                                                                        | When`lockToContainerEdges`is set to`true`, this controls the offset distance between the sortable helper and the top/bottom edges of it's parent`SortableContainer`. Percentage values are relative to the height of the item currently being sorted. If you wish to specify different behaviours for locking to the _top_ of the container vs the _bottom_, you may also pass in an`array`(For example:`["0%", "100%"]`).                                             |
 | getContainer                      | Function                                                  |                                                                                                                | Optional function to return the scrollable container element. This property defaults to the `SortableContainer` element itself or (if `useWindowAsScrollContainer` is true) the window. Use this function to specify a custom container object (eg this is useful for integrating with certain 3rd party components such as `FlexTable`). This function is passed a single parameter (the `wrappedInstance` React element) and it is expected to return a DOM element. |
-| getHelperDimensions               | Function                                                  | [Function](https://github.com/clauderic/react-sortable-hoc/blob/master/src/SortableContainer/index.js#L74-L77) | Optional `function({node, index, collection})` that should return the computed dimensions of the SortableHelper. See [default implementation](https://github.com/clauderic/react-sortable-hoc/blob/master/src/SortableContainer/index.js#L74-L77) for more details                                                                                                                                                                                                     |
+| getHelperDimensions               | Function                                                  | [Function](https://github.com/clauderic/react-sortable-hoc/blob/master/src/SortableContainer/index.js#L74-L77) | Optional `function({node, index, collection})` that should return the computed dimensions of the SortableHelper. See [default implementation](https://github.com/clauderic/react-sortable-hoc/blob/master/src/SortableContainer/defaultGetHelperDimensions.js) for more details                                                                                                                                                                                                     |
 | helperContainer                   | HTMLElement | Function                               | `document.body`                                                                                                | By default, the cloned sortable helper is appended to the document body. Use this prop to specify a different container for the sortable clone to be appended to. Accepts an `HTMLElement` or a function returning an `HTMLElement` that will be invoked before right before sorting begins                                                                                                                                                                            |
 | disableAutoscroll                 | Boolean                                                   | `false`                                                                                                        | Disables autoscrolling while dragging                                                                                                                                                                                                                                                                                                                                                                                                                                  |