Update CanComment.php

With these changes, there is no problem using the "Custom Polymorphic Types"

Author: mohammad-y

src/CanComment.php

@@ -26,7 +26,7 @@ public function comment($commentable, $commentText = '', $rate = 0)
             'rate'           => ($commentable->getCanBeRated()) ? $rate : null,
             'approved'       => ($commentable->mustBeApproved() && ! $this->isAdmin()) ? false : true,
             'commented_id'   => $this->id,
-            'commented_type' => get_class()
+            'commented_type' => $this->getMorphClass()
         ]);
 
         $commentable->comments()->save($comment);