Make example clearer.

Author: davidjbradshaw

README.md

@@ -14,7 +14,7 @@
 Inclued the [imageMapResizer.min.js](https://raw.github.com/davidjbradshaw/imagemap-resizer/master/js/imageMapResizer.min.js) script then add the following call to the bottom of your page:
 
 ```js
-imageMapResize([selector || map object]);
+imageMapResize();
 ```
 
 Optionally you can pass a CSS selector that returns a collection of map tags, for example 'map.myMap'. Or a direct reference to a map object in the DOM.