updating the readme for the ability for the item handle to listen for custom events.
updating the readme for the ability for the item handle to listen for custom events.

pixnet/ng-sortable,TonyNguyen101/ng-sortable,isaaclyman/ng-sortable,Drooids/ng-sortable,TonyNguyen101/ng-sortable,trtshen/ng-sortable,marydavis/ng-sortable,suigezi/ng-sortable,pixnet/ng-sortable,D4H/ng-sortable,happio/ng-sortable,marydavis/ng-sortable,crysislinux/ng-sortable,a5hik/ng-sortable,az8321550/ng-sortable,Drooids/ng-sortable,happio/ng-sortable,a5hik/ng-sortable,isaaclyman/ng-sortable,kucukkanat/ng-sortable,kucukkanat/ng-sortable,Dominooo/ng-sortable,crysislinux/ng-sortable,D4H/ng-sortable,robindemourat/ng-sortable,sarawutymtz/ng-sortable,gareys/ng-sortable,gareys/ng-sortable,dtee/ng-sortable,suigezi/ng-sortable,Dzeks/ng-sortable,Jhegs/ng-sortable-custom,az8321550/ng-sortable,robindemourat/ng-sortable,dtee/ng-sortable,trtshen/ng-sortable,sarawutymtz/ng-sortable,Jhegs/ng-sortable-custom,Dominooo/ng-sortable,Dzeks/ng-sortable