make Comment constructor attributes optional

Author: troosan

samples/Sample_37_Comments.php

@@ -21,7 +21,7 @@
 $section->addTextBreak(2);
 
 // Let's create a comment that we will link to a start element and an end element
-$commentWithStartAndEnd = new \PhpOffice\PhpWord\Element\Comment('Foo Bar', new \DateTime(), '');
+$commentWithStartAndEnd = new \PhpOffice\PhpWord\Element\Comment('Foo Bar', new \DateTime());
 $commentWithStartAndEnd->addText('A comment with a start and an end');
 $phpWord->addComment($commentWithStartAndEnd);
 
@@ -36,7 +36,7 @@
 $section->addTextBreak(2);
 
 // Let's add a comment on an image
-$commentOnImage = new \PhpOffice\PhpWord\Element\Comment('Mr Smart', new \DateTime(), '');
+$commentOnImage = new \PhpOffice\PhpWord\Element\Comment('Mr Smart', new \DateTime());
 $imageComment = $commentOnImage->addTextRun();
 $imageComment->addText('Hey, Mars does look ');
 $imageComment->addText('red', array('color' => 'FF0000'));

src/PhpWord/Element/Comment.php

@@ -57,7 +57,7 @@ class Comment extends TrackChange
      * @param \DateTime $date
      * @param string $initials
      */
-    public function __construct($author, $date, $initials)
+    public function __construct($author, $date = null, $initials = null)
     {
         parent::__construct($author, $date);
         $this->initials = $initials;

src/PhpWord/Element/TrackChange.php

@@ -47,7 +47,7 @@ class TrackChange extends AbstractContainer
      * @param string $author
      * @param \DateTime $date
      */
-    public function __construct($author, \DateTime $date)
+    public function __construct($author, \DateTime $date = null)
     {
         $this->author = $author;
         $this->date = $date;