Update changelog

Author: Robotgiggle

CHANGELOG.md

@@ -39,6 +39,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 - Massively improved ru_ru translations, by JustS-js and LedinecMing in [#832](https://github.com/FallingColors/HexMod/pull/832).
 - Changed the invalid-pattern mishap to display the offending pattern, by Robotgiggle in [#951](https://github.com/FallingColors/HexMod/pull/951).
 - Changed the invalid-iota mishap to display the type of the offending iota along with the iota itself, by Robotgiggle in [#951](https://github.com/FallingColors/HexMod/pull/951).
+- Changed the disallowed-action mishap to properly display the offending action, by Robotgiggle in [#970](https://github.com/FallingColors/HexMod/pull/970).
 
 ### Fixed