Updating app to ionic-angular latest beta

src/app/tab3/tab3.page.ts

@@ -0,0 +1,8 @@
+import { Component } from '@angular/core';
+
+@Component({
+  selector: 'app-tab3',
+  templateUrl: 'tab3.page.html',
+  styleUrls: ['tab3.page.scss']
+})
+export class Tab3Page {}