How to put dropdown select in the angular select with ng-change?

Question

I put a directive to the dropdown, but when I select a state does not change the dropdown and ng-change.

<select class="slc-state" data-ng-model="state" data-ng-options="state.name for state in states track by state.id" 
data-ng-change="updateState();">
<option value="">Select State</option>

http://plnkr.co/edit/PenIm3NdUHJgXxOdrXMf?p=preview