Apply php-cs-fixer fix --rules nullable_type_declaration_for_default_null_value

Author: nicolas-grekas

SmscTransport.php

@@ -34,7 +34,7 @@ final class SmscTransport extends AbstractTransport
     private $password;
     private $from;
 
-    public function __construct(string $login, string $password, string $from, HttpClientInterface $client = null, EventDispatcherInterface $dispatcher = null)
+    public function __construct(string $login, string $password, string $from, ?HttpClientInterface $client = null, ?EventDispatcherInterface $dispatcher = null)
     {
         $this->login = $login;
         $this->password = $password;

Tests/SmscTransportTest.php

@@ -22,7 +22,7 @@
 
 final class SmscTransportTest extends TransportTestCase
 {
-    public static function createTransport(HttpClientInterface $client = null): TransportInterface
+    public static function createTransport(?HttpClientInterface $client = null): TransportInterface
     {
         return new SmscTransport('login', 'password', 'MyApp', $client ?? new MockHttpClient());
     }