Add errer reporting in example and minor clean up

Author: SimonFrings

README.md

@@ -513,7 +513,7 @@ See also the [CHANGELOG](CHANGELOG.md) for details about version upgrades.
 This project aims to run on any platform and thus does not require any PHP
 extensions and supports running on legacy PHP 5.4 through current PHP 7+ and
 HHVM.
-It's *highly recommended to use PHP 7+* for this project.
+It's *highly recommended to use the latest supported PHP version* for this project.
 
 ## Tests
 
@@ -551,7 +551,7 @@ $ docker run -it --rm --net=host \
 To run the test suite, go to the project root and run:
 
 ```bash
-$ php vendor/bin/phpunit
+$ vendor/bin/phpunit
 ```
 
 ## License

examples/12-slow-stream.php

@@ -72,4 +72,6 @@
     });
 
     $connection->quit();
-}, 'printf');
+}, function (Exception $e) {
+    echo 'Error: ' . $e->getMessage() . PHP_EOL;
+});