Update CHANGELOG.md

Author: Toshiaki Hishinuma

CHANGELOG.md

@@ -19,8 +19,12 @@ https://keepachangelog.com/ja/1.0.0/ に基づいて記述していく
 -->
 Unreleased
 -----------
+
+0.15.2 - 2021/12/26
+-----------
 ### Fixed
-- Fix Serious monolish container bug https://gitlab.ritc.jp/ricos/monolish/-/merge_requests/430
+- Fix monolish-container serious bug in master branch 
+- Fix serious monolish container bug https://gitlab.ritc.jp/ricos/monolish/-/merge_requests/430
 
 ### Changed
 - Start developing 0.15.2 https://gitlab.ritc.jp/ricos/monolish/-/merge_requests/429