CHANGELOG: Add entry for IFLA_MCTP decode feature

Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>

Author: jk-ozlabs

CHANGELOG.md

@@ -11,6 +11,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 1. `mctpd` now queries endpoints for their vendor-defined message support,
    and publishes as the newly-specced `VendorDefinedMessageTypes` dbus property.
 
+2. `mctp`'s verbose mode will now decode `IFLA_MCTP` attributes in netlink
+   message data
+
 ### Fixes
 
 1. mctpd's interface objects now expose the BusOwner1 interface when set