fix(app-preferences): value can be any type (#1498)

* refactor(AppPreferences): changed input type

fix #1334

* Update index.ts

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

@@ -47,13 +47,13 @@ export class AppPreferences extends IonicNativePlugin {
    *
    * @param {string} dict Dictionary for key (OPTIONAL)
    * @param {string} key Key
-   * @param {string} value Value
+   * @param {any} value Value
    * @return {Promise<any>} Returns a promise
    */
   @Cordova({
     callbackOrder: 'reverse'
   })
-  store(dict: string, key: string, value?: string): Promise<any> {
+  store(dict: string, key: string, value?: any): Promise<any> {
     return;
   }