CHANGES: Add documentation for changes in 0.5.5

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
diff --git a/CHANGES b/CHANGES
index 4f989bd..6c72508 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,5 +1,10 @@
 CHANGES - changes for swtpm
 
+version 0.5.5:
+  - swtpm:
+    - Use uint64_t in tlv_data_append() to avoid integer overflows
+    - Use uint64_t to avoid integer wrap-around when adding a uint32_t
+
 version 0.5.4:
   - swtpm:
     - Do not chdir(/) when using --daemon