Bug in article excerpt where author name uses front matter directly

[caendesilva]

In framework\resources\views\components\article-excerpt.blade.php, the Author name is fetched from the front matter

<span itemprop="name">
    {{ $post->matter['author'] }}
</span>

Which can cause the following error: htmlspecialchars(): Argument #1 ($string) must be of type string, array given.

This should be able to be fixed by using the $post->author property instead