use author and contributors meta tag to get the authorName

Author: oscarotero

src/Providers/Html.php

@@ -107,6 +107,14 @@ public function getUrl()
         return $this->bag->get('canonical');
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function getAuthorName()
+    {
+        return $this->bag->get('author') ?: $this->bag->get('contributors');
+    }
+
     /**
      * {@inheritdoc}
      */