Custom cache directory line was not written

I added line which helps to add custome cache directory instead of using prebuilt $CACHE_PATH

sample/bootstrap.php

@@ -88,6 +88,7 @@ function getApiContext($clientId, $clientSecret)
             'log.FileName' => '../PayPal.log',
             'log.LogLevel' => 'DEBUG', // PLEASE USE `INFO` LEVEL FOR LOGGING IN LIVE ENVIRONMENTS
             'cache.enabled' => true,
+            //'cache.FileName' => '/PaypalCache' // for determining paypal cache directory
             // 'http.CURLOPT_CONNECTTIMEOUT' => 30
             // 'http.headers.PayPal-Partner-Attribution-Id' => '123123123'
             //'log.AdapterFactory' => '\PayPal\Log\DefaultLogFactory' // Factory class implementing \PayPal\Log\PayPalLogFactory