chore: update CHANGELOG

Author: jpraynaud

CHANGELOG.md

@@ -9,6 +9,14 @@ As a minor extension, we have adopted a slightly different versioning convention
 
 ## Mithril Distribution [XXXX] - UNRELEASED
 
+- **BREAKING** changes in Mithril client CLI:
+
+  - To fast bootstrap a Cardano node, the new `--include-ancillary` option has been added to the _Cardano node database_ command in the Mithril client CLI.
+  - Without this option, only final immutable files are downloaded and the ledger state must be computed from the genesis block.
+  - The `--include-ancillary` option requires the usage of an **ancillary verification key** (`--ancillary-verification-key` or `ANCILLARY_VERIFICATION_KEY`) which is specified in the [Networks configuration](https://mithril.network/doc/manual/getting-started/network-configurations) page.
+
+- Support for ancillary files signature for _Cardano node database_ and _Cardano node database v2_ certification with IOG key.
+
 - Add `with_origin_tag` function to the Mithril client library to record the origin of client requests.
 
 - **UNSTABLE** implement support for leader/follower registration in the infrastructure.