Update CHANGELOG.md

Author: arl

CHANGELOG.md

@@ -36,6 +36,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Add StringMatch filter which discards/keeps records based on the result of string comparisons  [#102](https://github.com/AdRoll/baker/pull/102)
 - Add PartialClone filter [#107](https://github.com/AdRoll/baker/pull/107)
 - Add `[validation]` section in TOML in which users can define record validation through regex [#122](https://github.com/AdRoll/baker/pull/122)
+- Add LUA filter [#110](https://github.com/AdRoll/baker/pull/110)
 
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