refactor: remove app-update plugin

BREAKING CHANGE: app-update plugin is removed for violating Google Play Store policies

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

@@ -1,66 +0,0 @@
-import { Injectable } from '@angular/core';
-import { Cordova, IonicNativePlugin, Plugin } from '@ionic-native/core';
-
-export interface AppUpdateOptions {
-  authType?: string;
-  username?: string;
-  password?: string;
-  skipPromptDialog?: boolean;
-  skipProgressDialog?: boolean;
-}
-
-/**
- * @name App Update
- * @description
- * This plugin does self-update for android
- *
- * @usage
- *
- * You should first host an XML file on your server with the following data in it:
- * ```xml
- * <update>
- *     <version>302048</version>
- *     <name>APK Name</name>
- *     <url>https://your-remote-api.com/YourApp.apk</url>
- * </update>
- * ```
- *
- * Then use the following code:
- *
- * ```typescript
- * import { AppUpdate } from '@ionic-native/app-update/ngx';
- *
- * constructor(private appUpdate: AppUpdate) {
- *
- *    const updateUrl = 'https://your-remote-api.com/update.xml';
- *    this.appUpdate.checkAppUpdate(updateUrl).then(() => { console.log('Update available') });
- *
- * }
- * ```
- *
- * The plugin will compare the app version and update it automatically if the API has a newer version to install.
- * @interfaces
- * AppUpdateOptions
- */
-@Plugin({
-  pluginName: 'AppUpdate',
-  plugin: 'cordova-plugin-app-update',
-  pluginRef: 'AppUpdate',
-  repo: 'https://github.com/vaenow/cordova-plugin-app-update',
-  platforms: ['Android'],
-})
-@Injectable()
-export class AppUpdate extends IonicNativePlugin {
-  /**
-   * Check and update
-   * @param {string} updateUrl update api url
-   * @param {AppUpdateOptions} [options] options
-   * @return {Promise<any>} Returns a promise that resolves when something happens
-   */
-  @Cordova({
-    callbackOrder: 'reverse',
-  })
-  checkAppUpdate(updateUrl: string, options?: AppUpdateOptions): Promise<any> {
-    return;
-  }
-}