add http client module for table http example (#319)

TODO: Remove usage of deprecated HttpModule

Author: andrewseguin

src/app/app-module.ts

@@ -32,6 +32,7 @@ import {DocViewerModule} from './shared/doc-viewer/doc-viewer-module';
 import {
   CanActivateComponentSidenav
 } from './pages/component-sidenav/component-sidenav-can-load-guard';
+import {HttpClientModule} from '@angular/common/http';
 
 @NgModule({
   imports: [
@@ -40,6 +41,7 @@ import {
     ExampleModule,
     FormsModule,
     HttpModule,
+    HttpClientModule,
     MatNativeDateModule,
     RouterModule.forRoot(MATERIAL_DOCS_ROUTES),