Update CHANGELOG.md

Co-authored-by: Linwei Shang <[email protected]>

Author: Eric Swanson

CHANGELOG.md

@@ -13,7 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Added node metrics, ECDSA, and Bitcoin functions to `MgmtMethod`. Most do not have wrappers in `ManagementCanister` because only canisters can call these functions.
 * Added `FetchCanisterLogs` function to `MgmtMethod` and a corresponding wrapper to `ManagementCanister`.
 * Updated the `ring` crate to 0.17.7.  `ring` 0.16 has a bug where it requires incorrect Ed25519 PEM encoding. 0.17.7 fixes that and is backwards compatible.
-* Agent::fetch_root_key() now returns an error, and sets its root key to an empty vector, if called on the mainnet.
+* Agent::fetch_root_key() now returns an error, and sets its root key to an empty vector, if got the same root key as the mainnet. This reduce the potentiality of MITM attack.
 
 ## [0.33.0] - 2024-02-08