Fix append behaviour for STDOUT

Change-Id: I295dc5e16a5c63475d418b97bc143b6d54a269f5
diff --git a/script/korapxml2conllu b/script/korapxml2conllu
index f50a736..a3c0f0f 100755
--- a/script/korapxml2conllu
+++ b/script/korapxml2conllu
@@ -26,7 +26,7 @@
 
 my $lm_training_data = 0;
 
-our $VERSION = '0.6.0';
+our $VERSION = '0.6.1';
 
 our $VERSION_MSG = "\nkorapxml2conllu - v$VERSION\n";