Update example to new eventloop API

Author: SimonFrings

README.md

@@ -8,7 +8,7 @@ built on top of [ReactPHP](https://reactphp.org/).
 Once [installed](#install), you can use the following code turn any blocking function (such as PHP's built-in [`file_get_contents()`](https://www.php.net/manual/en/function.file-get-contents.php) function) into a non-blocking one:
 
 ```php
-$file_get_contents = (new Clue\React\Pq\Executor($loop))->fun('file_get_contents');
+$file_get_contents = (new Clue\React\Pq\Executor())->fun('file_get_contents');
 
 $file_get_contents(__FILE__)->then(function (string $contents) {
     echo $contents;