message: Mention changes in changelog
diff: @@ -16,6 +16,10 @@ All notable changes to this project will be documented in this file. The format
  ### Changed
  * Support building and testing using stable Rust.
  +### Removed
  +* The inofficial support for nix-related derivations and support tooling has been removed.
  +* Experimental, nix-based kubernetes testing support has been removed.
  +
  ## [1.3.0] - 2021-07-19
  