fix: filter selectable services by participant's age

src/BusProNet/XmlParser/ServicesParser.php

@@ -34,6 +34,9 @@ class ServicesParser extends AbstractParser
                 $service->direction = $node->attr('richtung');
             }
 
+            $service->ageFrom = $this->getIntOrNullValue($node->filterXPath('//altervon'));
+            $service->ageTo = $this->getIntOrNullValue($node->filterXPath('//alterbis'));
+
             $services[$service->id] = $service;
         });