Update CHANGELOG.md for #1567

Author: rtzoeller

CHANGELOG.md

@@ -3,6 +3,16 @@
 All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](https://semver.org/).
 
+## [Unreleased] - ReleaseDate
+### Added
+
+- Added `EPOLLEXCLUSIVE` on Android.
+  (#[1567](https://github.com/nix-rust/nix/pull/1567))
+
+### Changed
+### Fixed
+### Removed
+
 ## [0.23.0] - 2021-09-28
 ### Added