Update example to new eventloop API

Author: SimonFrings

README.md

@@ -18,7 +18,7 @@ Dave	1995-01-01	3.1.1.1
 Once [installed](#install), you can use the following code to read a TSV stream from `STDIN`:
 
 ```php
-$stdin = new React\Stream\ReadableResourceStream(STDIN, $loop);
+$stdin = new React\Stream\ReadableResourceStream(STDIN);
 $stream = new Clue\React\Tsv\Decoder($stdin);
 
 $stream->on('data', function ($data) {