add changelog entry for 2.8.2

Author: frangio

packages/cli/changelog.md

@@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## v2.8.2 - 2020-04-13
+
+### Fixed
+- Fixed the text of `oz deploy --help`. ([#1521](https://github.com/OpenZeppelin/openzeppelin-sdk/pull/1521))
+
 ## v2.8.1 - 2020-04-08
 
 ### Fixed