Use the dedicated CommentElement class for comments

Author: kylekatarnls

src/Phug/Compiler/CommentCompiler.php

@@ -4,7 +4,7 @@
 
 use Phug\AbstractNodeCompiler;
 use Phug\CompilerException;
-use Phug\Formatter\Element\TextElement;
+use Phug\Formatter\Element\CommentElement;
 use Phug\Formatter\ElementInterface;
 use Phug\Parser\Node\CommentNode;
 use Phug\Parser\NodeInterface;
@@ -19,12 +19,13 @@ public function compileNode(NodeInterface $node, ElementInterface $parent = null
             );
         }
 
+        /** @var CommentNode $node */
         if (!$node->isVisible()) {
             return null;
         }
 
         $comment = $this->getTextChildren($node);
 
-        return new TextElement('<!-- '.$comment.' -->');
+        return new CommentElement($comment);
     }
 }