Add 'custom exception on params too deep error' change to CHANGELOG. (#…

…1914)

- format latest versions changes in consistent way

CHANGELOG.md

@@ -4,11 +4,19 @@ All notable changes to this project will be documented in this file. For info on
 
 ## [2.2.3.1] - 2022-05-27
 
+### Security
+
 - [CVE-2022-30123] Fix shell escaping issue in Common Logger
 - [CVE-2022-30122] Restrict parsing of broken MIME attachments
 
+### Changed
+
+- Use custom exception on params too deep error. ([#1838](https://github.com/rack/rack/pull/1838), [@simi](https://github.com/simi))
+
 ## [2.2.3] - 2020-02-11
 
+### Security
+
 - [CVE-2020-8184] Only decode cookie values
 
 ## [2.2.2] - 2020-02-11