chore: use arrow function (#4599)

Author: Shyam-Chen

packages/@angular/cli/blueprints/ng2/files/e2e/app.e2e-spec.ts

@@ -1,6 +1,6 @@
 import { <%= jsComponentName %>Page } from './app.po';
 
-describe('<%= htmlComponentName %> App', function() {
+describe('<%= htmlComponentName %> App', () => {
   let page: <%= jsComponentName %>Page;
 
   beforeEach(() => {