refactor: remove not-needed animations

lib/app.module.ts

@@ -1,12 +1,11 @@
 import { NgModule } from '@angular/core';
 import { BrowserModule } from '@angular/platform-browser';
-import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
 
 import { RedocModule } from './redoc.module';
 import { Redoc } from './components/index';
 
 @NgModule({
-  imports: [ BrowserModule, BrowserAnimationsModule, RedocModule ],
+  imports: [ BrowserModule, RedocModule ],
   bootstrap: [ Redoc ],
   exports: [ Redoc ]
 })

lib/components/SideMenu/side-menu-items.html

@@ -7,7 +7,7 @@
      <polygon points="17.3 8.3 12 13.6 6.7 8.3 5.3 9.7 12 16.4 18.7 9.7 "/>
    </svg>
   </label>
-  <ul *ngIf="item.items" class="menu-subitems" [@itemAnimation]="(item.active || item.isGroup) ? 'expanded' : 'collapsed'">
+  <ul *ngIf="item.items" class="menu-subitems">
     <side-menu-items [items]="item.items" (activate)="activateItem($event)"> </side-menu-items>
   </ul>
 </li>

lib/components/SideMenu/side-menu.ts

@@ -22,17 +22,6 @@ const global = window;
   selector: 'side-menu-items',
   templateUrl: './side-menu-items.html',
   styleUrls: ['./side-menu-items.css'],
-  animations: [
-    trigger('itemAnimation', [
-      state('collapsed, void',
-        style({ height: '0px' })),
-      state('expanded',
-        style({ height: '*' })),
-      transition('collapsed <=> expanded', [
-        animate('200ms ease')
-      ])
-    ])
-  ]
 })
 export class SideMenuItems {
   @Input() items: MenuItem[];

package.json

@@ -50,7 +50,6 @@
   "author": "Roman Hotsiy",
   "license": "MIT",
   "devDependencies": {
-    "@angular/animations": "^4.0.0",
     "@angular/common": "^4.0.0",
     "@angular/compiler": "^4.0.0",
     "@angular/compiler-cli": "^4.0.0",

tests/spec-bundle.js

@@ -23,7 +23,6 @@ var ErrorHandler = require('@angular/core').ErrorHandler;
 var forwardRef = require('@angular/core').forwardRef;
 var BrowserDynamicTestingModule = require('@angular/platform-browser-dynamic/testing').BrowserDynamicTestingModule;
 var platformBrowserDynamicTesting = require('@angular/platform-browser-dynamic/testing').platformBrowserDynamicTesting;
-var BrowserAnimationsModule = require('@angular/platform-browser/animations').BrowserAnimationsModule;
 var SpecManager = require('../lib/utils/spec-manager').SpecManager;
 var services = require('../lib/services/index');
 var REDOC_PIPES = require('../lib/utils/pipes').REDOC_PIPES;
@@ -39,7 +38,6 @@ TestBed.initTestEnvironment(
 
 beforeEach(function() {
   TestBed.configureTestingModule({
-    imports: [BrowserAnimationsModule],
     providers: [
       SpecManager,
       services.AppStateService,