Revert "Add changelog entry"

This reverts commit 77ae1bd

Author: kilokahn

CHANGELOG.md

@@ -3,12 +3,7 @@ All notable changes to this project are documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/).
 
-## 2.2.4 (Unreleased)
-
-### Changed
-- Support updating size of offline volumes
-
-## 2.2.3 - 2018-09-06
+## 2.2.3
 
 ### Added
 - Support specifying a backup policy at the time of creating a Volume