Update deprecated Configuration constructor

Change-Id: If773c9dc7960b28870be2de544996a4d0046c78b
diff --git a/src/main/java/de/ids_mannheim/korap/plkexport/Service.java b/src/main/java/de/ids_mannheim/korap/plkexport/Service.java
index b57667a..2e3deb0 100644
--- a/src/main/java/de/ids_mannheim/korap/plkexport/Service.java
+++ b/src/main/java/de/ids_mannheim/korap/plkexport/Service.java
@@ -100,7 +100,8 @@
     InputStream is = cl.getResourceAsStream("assets/export.js");
     private final String exportJsStr = streamToString(is);
 
-    Configuration cfg = new Configuration();
+    Configuration cfg = new Configuration(Configuration.VERSION_2_3_32);
+
     {
         cfg.setClassForTemplateLoading(Service.class, "/assets/templates");
         cfg.setDefaultEncoding("UTF-8");