Add 3.2.1 Changelog

Signed-off-by: Paul Elliott <paul.elliott@arm.com>
diff --git a/ChangeLog b/ChangeLog
index 6b1bb21..6dfb23f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 Mbed TLS ChangeLog (Sorted per branch, date)
 
+= Mbed TLS 3.2.1 branch released 2022-07-12
+
+Bugfix
+   *  Re-add missing generated file library/ssl_debug_helpers_generated.c
+
 = Mbed TLS 3.2.0 branch released 2022-07-11
 
 Default behavior changes