Update changelog

Author: ismail-syed

packages/react-i18n/CHANGELOG.md

@@ -6,10 +6,12 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ---
 
-## [Unreleased]
+<!-- ## [Unreleased] -->
+
+## [2.3.4] - 2020-01-20
 
-- Fixed `unformatNumber` for numbers using a period as the thousand separator ([#1215](https://github.com/Shopify/quilt/pull/1215))
 - Added `Gip` currency code value ([#1235](https://github.com/Shopify/quilt/pull/1235))
+- Fixed `unformatNumber` for numbers using a period as the thousand separator ([#1215](https://github.com/Shopify/quilt/pull/1215))
 
 ## [2.3.0] - 2019-11-29