Bump to v4.9.0.

throttle.js

@@ -17,7 +17,7 @@ define(['./debounce', './isObject'], function(debounce, isObject) {
    * invoked on the trailing edge of the timeout only if the throttled function
    * is invoked more than once during the `wait` timeout.
    *
-   * See [David Corbacho's article](http://drupalmotion.com/article/debounce-and-throttle-visual-explanation)
+   * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
    * for details over the differences between `_.throttle` and `_.debounce`.
    *
    * @static