fix(index-app-content): add missing function

src/@ionic-native/plugins/index-app-content/index.ts

@@ -1,5 +1,6 @@
 import { Injectable } from '@angular/core';
 import { Cordova, IonicNativePlugin, Plugin } from '@ionic-native/core';
+import { Observable } from 'rxjs/Observable';
 
 export interface IndexItem {
  domain: string;
@@ -110,6 +111,16 @@ export class IndexAppContent extends IonicNativePlugin {
  clearItemsForIdentifiers(identifiers: Array<string>): Promise<any> {
  return;
  }
+
+ /**
+ * If user taps on a search result in spotlight then the app will be launched.
+ * You can register a Javascript handler to get informed when this happens.
+ * @returns {Observable<any>} returns an observable that notifies you when he user presses on the home screen icon
+ */
+ @CordovaFunctionOverride()
+ onItemPressed(): Observable<any> {
+ return;
+ }
 
  /**
  * You might want to avoid to update spotlight index too frequently.