title: Angular Material Chips not firing selection change event
body: <p>From Angular Material Chip <a href="https://material.angular.io/components/chips/api#MatChip" rel="nofollow noreferrer">docs</a>, there is a event for when the chip is selected or deselected:</p>
  <p><a href="https://i.stack.imgur.com/Rx4aF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Rx4aF.png" alt="enter image description here" /></a></p>
  <p>However, I am not able to get this event to fire in this stackblitz example</p>
  <p><a href="https://stackblitz.com/edit/angular-3jpqtx?embed=1&amp;file=src/app/chips-input-example.ts" rel="nofollow noreferrer">https://stackblitz.com/edit/angular-3jpqtx?embed=1&amp;file=src/app/chips-input-example.ts</a></p>
  <p>What am I doing wrong?</p>