Added Timeout Example

README.md

@@ -19,3 +19,16 @@ It's just simple as that.
 `wait-for-it.js` uses HTML [`MutationObserver`](https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver) to wait for the selectors registered to it. Whenever an element gets added to the document, if checks for the registered selectors and if it finds an element with that selector it executes your `callback` function and removes that `callback` from its queue to prevent retriggering.
 
 And that is how the magic happens.
+
+## Update v0.1.1:
+Now you can specify a third parameter `timeout` to `waitForElement`. If the specific element does not appear in the given time your callback will be called with a `timeout` = `true` instead and the `selector` will also be removed from the queue. Here is an example:
+
+```javascript
+waitForElement('#NonExistentSelector', function (timeout) {
+    if(timeout === true) {
+        console.log('As Expected, Element with #NonExistentSelector did not appear in 1000 milliseconds.');
+        return;
+    }
+    console.log('This is not possible at all!');
+}, 1000);
+```