title: Ionic 4 beta 18 - ion-item and ion-button with routerLink don't change route
body: <p>I just updated from ionic 4 beta 17 to 18 and a breaking change in <code>&lt;ion-item&gt;</code> and <code>&lt;ion-button&gt;</code> was introduced. The <strong>href</strong> was replaced with <strong>routerLink</strong>. </p>
  
  <p>I added this to my code and now the routing doesn't work anymore.
  Most of the time the compiler throws errors and says, that routerLink does not exist in ion-item.</p>
  
  <p>What did i do wrong? Or is it angular?</p>
  
  <pre><code>"@ionic/angular": "~4.0.0-beta.18",
  "@ionic/core": "~4.0.0-beta.18",
  "@angular/core": "^7.1.3",
  "@angular/router": "~7.1.3",
  
  &lt;ion-item text-wrap class="nav-item" routerDirection="forward" 
          [routerLink]="p.url"
          *ngFor="let p of listOfPages; let i = index"
          [class.active-item]="checkActivePath(p.url)"
          [class.last-item]="i === (listOfPages.length - 1)"&gt;
      &lt;ion-label class="nav-label"&gt;
          &lt;ion-img [src]="p.icon" class="nav-icon"&gt;&lt;/ion-img&gt;
          &lt;div class="text-block"&gt;
              {{ p.title }}
          &lt;/div&gt;
      &lt;/ion-label&gt;
  &lt;/ion-item&gt;
  </code></pre>