Fix changelog.

Author: ioquatix

CHANGELOG.md

@@ -15,13 +15,6 @@ All notable changes to this project will be documented in this file. For info on
 - [CVE-2025-61780](https://github.com/advisories/GHSA-r657-rxjc-j557) Improper handling of headers in `Rack::Sendfile` may allow proxy bypass.
 - [CVE-2025-61919](https://github.com/advisories/GHSA-6xw4-3v39-52mm) Unbounded read in `Rack::Request` form parsing can lead to memory exhaustion.
 
-## [2.2.20] - 2025-11-03
-
-### Fixed
-
-- Multipart parser: limit MIME header size check to the unread buffer region to avoid false `multipart mime part header too large` errors when previously read data accumulates in the scan buffer. ([#2392](https://github.com/rack/rack/pull/2392), [@alpaca-tc](https://github.com/alpaca-tc), [@willnet](https://github.com/willnet), [@krororo](https://github.com/krororo))
-
-
 ## [2.2.19] - 2025-10-07
 
 ### Security