fix: invalid prop-types. (jquense#1435)

Author: tai2

src/addons/dragAndDrop/withDragAndDrop.js

@@ -101,8 +101,8 @@ export default function withDragAndDrop(Calendar) {
         onStart: PropTypes.func,
         onEnd: PropTypes.func,
         onBeginAction: PropTypes.func,
-        onDropFromOutside: PropTypes.fun,
-        dragFromOutsideItem: PropTypes.fun,
+        onDropFromOutside: PropTypes.func,
+        dragFromOutsideItem: PropTypes.func,
         draggableAccessor: accessor,
         resizableAccessor: accessor,
         dragAndDropAction: PropTypes.object,