feat(market): add search method, return promises

src/plugins/market.ts

@@ -19,12 +19,30 @@ import { Plugin, Cordova } from './plugin';
   repo: 'https://github.com/xmartlabs/cordova-plugin-market'
 })
 export class Market {
+
   /**
    * Opens an app in Google Play / App Store
    * @param appId {string} Package name
-   * @param callbacks {Object} Optional callbacks in the format {success?: Function, failure?: Function}
+   * @return {Promise<any>}
+   */
+  @Cordova({
+    callbackStyle: 'object',
+    successName: 'success',
+    errorName: 'failure'
+  })
+  static open(appId: string): Promise<any> { return }
+
+  /**
+   * Search apps by keyword
+   * @param keyword {string} Keyword
+   * @return {Promise<any>}
    */
-  @Cordova({sync: true})
-  static open(appId: string, callbacks?: {success?: Function, failure?: Function}): void { }
+  @Cordova({
+    callbackStyle: 'object',
+    successName: 'success',
+    errorName: 'failure',
+    platforms: ['Android']
+  })
+  static search(keyword: string): Promise<any> { return }
 
 }