Surpressed errors from stream_socket_accept()

PHP Warnings from stream_socket_accept() can occur when the connection is pulled before it's accepted

Author: AndrewCarterUK

src/Connection/StreamSocketConnectionPool.php

@@ -112,7 +112,7 @@ public function shutdown()
      */
     protected function acceptConnection(ConnectionHandlerFactoryInterface $connectionHandlerFactory)
     {
-        $clientSocket = stream_socket_accept($this->serverSocket);
+        $clientSocket = @stream_socket_accept($this->serverSocket);
 
         if (false === $clientSocket) {
             return;