[CS] Replace easy occurences of ?: with ??

Author: fancyweb

Command/CacheClearCommand.php

@@ -44,7 +44,7 @@ public function __construct(CacheClearerInterface $cacheClearer, Filesystem $fil
         parent::__construct();
 
         $this->cacheClearer = $cacheClearer;
-        $this->filesystem = $filesystem ?: new Filesystem();
+        $this->filesystem = $filesystem ?? new Filesystem();
     }
 
     /**

Routing/Router.php

@@ -49,7 +49,7 @@ public function __construct(ContainerInterface $container, $resource, array $opt
     {
         $this->container = $container;
         $this->resource = $resource;
-        $this->context = $context ?: new RequestContext();
+        $this->context = $context ?? new RequestContext();
         $this->logger = $logger;
         $this->setOptions($options);