Difference between SimpleChange and SimpleChanges : <p>There are two terms in angular 5  <a href="https://angular.io/api/core/SimpleChange" rel="noreferrer">SimpleChange</a>
 and <a href="https://angular.io/api/core/SimpleChanges" rel="noreferrer">SimpleChanges</a>, I didn't understand clearly from the official document could someone please explain me ??/</p>
