Bump version to 0.6.0

Change-Id: I7fcabc189f1f841d59e330b0a1f66846f42f5823
diff --git a/Changes b/Changes
index 55212ca..4b4e815 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,4 @@
+0.6.0 2023-01-13
         - korapxml2conllu:
             - the sigle-pattern option now affects the entire sigle
             - handle docid attributes correctly if they are in a different line than their parent element <layer>