java_gen/pom.xml: Bump version to 0.4.1

Due to renaming several enums.
diff --git a/java_gen/pre-written/pom.xml b/java_gen/pre-written/pom.xml
index 1c405ce..6b60fd1 100644
--- a/java_gen/pre-written/pom.xml
+++ b/java_gen/pre-written/pom.xml
@@ -10,7 +10,7 @@
 
     <groupId>org.projectfloodlight</groupId>
     <artifactId>openflowj</artifactId>
-    <version>0.4.0-SNAPSHOT</version>
+    <version>0.4.1-SNAPSHOT</version>
     <packaging>jar</packaging>
 
     <name>OpenFlowJ-Loxi</name>