Update AssetBundle.php

     * @var array custom keys to be attached for asset files in bundle config to be passed later 
     * to [[\yii\web\View::registerJsFile()]] or [[\yii\web\View::registerCssFile()]] if you don't want
     * default keys auto-assignment (this may be useful if you have 2 different extensions that load the same
     * js script on one page).
     * Then it could be set in config file like this:
     * ```php
     * // ...
     * 'components' => [
     *   'assetManager' => [
     *       'bundles' => [
     *           'foo\abc\SomeAsset' => [
     *                'assetKeys' => ['somefile.js' => 'somekey']
     *           ],
     *           'bar\cde\AnotherAsset' => [
     *                'assetKeys' => ['somefile.js' => 'somekey']
     *           ],
     *       ],
     *   ],
     * ],
     * ```