Release 0.6.11

1. Add support of iframe for keyboard event
2. Add 'handlers' option
3. Drop support for IE <= 9
4. Allow children native scroll
5. Enhance browser compatibility
6. Minor bug fixes

package.json

@@ -1,6 +1,6 @@
 {
   "name": "perfect-scrollbar",
-  "version": "0.6.10",
+  "version": "0.6.11",
   "description": "Minimalistic but perfect custom scrollbar plugin",
   "author": "Hyunje Alex Jun <me@noraesae.net>",
   "contributors": [