get author from opengraph. related #159

Author: oscarotero

src/Providers/OpenGraph.php

@@ -140,6 +140,14 @@ public function getTags()
         return (array) $this->bag->get('tags') ?: [];
     }
 
+    /**
+     * {@inheritdoc}
+     */
+    public function getAuthorName()
+    {
+        return $this->bag->get('author');
+    }
+
     /**
      * {@inheritdoc}
      */