php 7.2 The each() function is deprecated

[LaxCorp]

The each() function is deprecated in php 7.2.

Please fix: sonata-project/notification-bundle/src/Backend/PostponeRuntimeBackend.php
line 82
while (list($key, $message) = each($this->messages)) {
$this->handle($message, $this->dispatcher);
}

on

foreach($this->messages as $key => $message){
$this->handle($message, $this->dispatcher);
}