Bump version to 0.6.0

Change-Id: I7fcabc189f1f841d59e330b0a1f66846f42f5823
diff --git a/script/korapxml2conllu b/script/korapxml2conllu
index 9f19987..f50a736 100755
--- a/script/korapxml2conllu
+++ b/script/korapxml2conllu
@@ -26,7 +26,7 @@
 
 my $lm_training_data = 0;
 
-our $VERSION = '0.5.0';
+our $VERSION = '0.6.0';
 
 our $VERSION_MSG = "\nkorapxml2conllu - v$VERSION\n";