ChangeLog: fx rm is a breaking change

Author: Anton-Latukha

ChangeLog.md

@@ -3,11 +3,13 @@
 
 ## [(diff)](https://github.com/haskell-nix/hnix/compare/0.13.1...master#files_bucket) WIP
 
-* Additional:
+Breaking:
 
   * `Nix.Effects`:
     * rm `pathExits` in favour of `doesPathExist` (in `Nix.Render`: `class MonadFile`: `doesPathExist`)
 
+* Additional:
+
   * `Nix.Utils`:
     * added type `TransformF`