Add version to the changes file.

Change-Id: I9e1e55ab33466e95809ac42173e6d1de48a213d4
diff --git a/Changes b/Changes
index d7247ac..2a82202 100644
--- a/Changes
+++ b/Changes
@@ -1,3 +1,4 @@
+0.64.6 2026-03-09
     - [performance] Add leaf cache. (diewald)
     - [bugfix] Fix fingerprinter (wasn't threadsafe; diewald)
     - [feature] Add --delete option to Krill-Indexer (diewald)