Fix append behaviour for STDOUT

Change-Id: I295dc5e16a5c63475d418b97bc143b6d54a269f5
diff --git a/Changes b/Changes
index 4b4e815..4035d1d 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,7 @@
+0.6.1 2023-03-22
+        - conllu2korapxml:
+            - Fix append for filehandle output.
+
 0.6.0 2023-01-13
         - korapxml2conllu:
             - the sigle-pattern option now affects the entire sigle