Bump version to 0.4.0

Change-Id: I1b6f9fee30a125fc7f071fb59afc5cf5a244a5e2
diff --git a/pom.xml b/pom.xml
index 8d8a4f4..69ea041 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
   <groupId>de.ids_mannheim.korap</groupId>
   <artifactId>KalamarExportPlugin</artifactId>
   <packaging>jar</packaging>
-  <version>0.3.4</version>
+  <version>0.4.0</version>
   <name>KalamarExportPlugin</name>
   <url>https://korap.ids-mannheim.de/</url>