Fix link label in README

Author: elisee

README.md

@@ -21,7 +21,7 @@ The `TreeView` constructor takes an optional second `options` parameter. It supp
  * `dropCallback` should be `null` or a function of the form `(dropInfo: { target: HTMLLIElement, where: string }, orderedNodes: HTMLElement[]) => boolean`. It'll be called when a drag'n'drop operation ends and must return whether to proceed with the reparenting/reordering or not.
  * `multipleSelection` is a boolean indicating whether to enable multiple item selection or not.
 
-See [TreeView.d.ts](https://github.com/sparklinlabs/dnd-tree-view/blob/master/index.d.ts) for the full API.
+See [index.d.ts](https://github.com/sparklinlabs/dnd-tree-view/blob/master/index.d.ts) for the full API.
 
 ## Building from source