Add Changelog entry for #767
Add Changelog entry for fix for alternative header/footers in CSR's.
diff --git a/ChangeLog b/ChangeLog
index 513f24f..dde23d8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -13,6 +13,8 @@
* Close a test gap in (D)TLS between the client side and the server side:
test the handling of large packets and small packets on the client side
in the same way as on the server side.
+ * Add support for alternative CSR headers, as used by Microsoft and defined
+ in RFC 7468. Found by Michael Ernst. Fixes #767.
= mbed TLS 2.13.1 branch released 2018-09-06