Replaced deprecated async() to waitForAsync() in tests

Author: AlexMiniApps

angular-code-input/src/lib/code-input.component.spec.ts

@@ -1,12 +1,12 @@
-import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+import { waitForAsync, ComponentFixture, TestBed } from '@angular/core/testing';
 
 import { CodeInputComponent } from './code-input.component';
 
 describe('CodeInputComponent', () => {
   let component: CodeInputComponent;
   let fixture: ComponentFixture<CodeInputComponent>;
 
-  beforeEach(async(() => {
+  beforeEach(waitForAsync(() => {
     TestBed.configureTestingModule({
       declarations: [ CodeInputComponent ]
     }).compileComponents();