Add note about Safari 9 breakage, ref #156

Author: dmethvin

README.md

@@ -2,6 +2,8 @@
 
 A [jQuery](http://jquery.com/) plugin that adds cross-browser mouse wheel support with delta normalization.
 
+#### Note: There is a [bug in Safari 9](https://github.com/jquery/jquery-mousewheel/issues/156) that prevents the plugin from working properly. See [this comment](https://github.com/jquery/jquery-mousewheel/issues/156#issuecomment-185433754) for some possible workarounds, and [watch this Webkit ticket](https://bugs.webkit.org/show_bug.cgi?id=149526) to find out if and when Apple will fix it.
+
 In order to use the plugin, simply bind the `mousewheel` event to an element.
 
 It also provides two helper methods called `mousewheel` and `unmousewheel`