Added type attribute to events property on agenda component (#687)

Co-authored-by: Nikola Metulev <[email protected]>

Author: jasonjoh

packages/mgt/src/components/mgt-agenda/mgt-agenda.ts

@@ -136,7 +136,8 @@ export class MgtAgenda extends MgtTemplatedComponent {
    * @type {Array<MicrosoftGraph.Event>}
    */
   @property({
-    attribute: 'events'
+    attribute: 'events',
+    type: Array
   })
   public events: MicrosoftGraph.Event[];