Apply CS fixes

src/FileSystem.php

@@ -115,6 +115,7 @@ class FileSystem implements FileSystemInterface
 
         if (stream_wrapper_register($this->scheme, $this->wrapperClass)) {
             $this->registry->add($this->scheme, $this);
+
             return true;
         }
 
@@ -132,6 +133,7 @@ class FileSystem implements FileSystemInterface
 
         if (stream_wrapper_unregister($this->scheme)) {
             $this->registry->remove($this->scheme, $this);
+
             return true;
         }
 

src/Node/NodeContainerInterface.php

@@ -9,7 +9,6 @@
  */
 namespace Vfs\Node;
 
-use DateTime;
 use IteratorAggregate;
 use Vfs\Exception\ExistingNodeException;
 use Vfs\Exception\MissingNodeException;

src/Node/Walker/NodeWalker.php

@@ -9,7 +9,6 @@
  */
 namespace Vfs\Node\Walker;
 
-use Vfs\Exception\InvalidNodeTypeException;
 use Vfs\Node\NodeContainerInterface;
 use Vfs\Node\NodeInterface;