message: Mention test port range change in changelog
diff: @@ -44,6 +44,7 @@ All notable changes to this project will be documented in this file. The format
  * Update pinned version of Rust to `nightly-2021-06-17`.
  * Don't shut down by default anymore if stalled. To enable set config option `shutdown_on_standstill = true` in `[consensus.highway]`.
  * Major rewrite of the contract runtime component.
  +* Ports used for local testing are now determined in a manner that hopefully leads to less accidental conflicts.
  ### Removed
  * Remove systemd notify support, including removal of `[network][systemd_support]` config option.
  