Update PersonioApiClient.php

Fixed reading of XML due to new XML structure

Author: svenpet90

Classes/Client/PersonioApiClient.php

@@ -41,7 +41,7 @@ public function fetchFeedItems(string $feedUrl): array
             return json_decode(
                 (string)json_encode($contentString),
                 true
-            )['position'];
+            );
         }
 
         return [];