update release note (#4563)

Author: J-shang

README.md

@@ -25,7 +25,7 @@ The tool manages automated machine learning (AutoML) experiments, **dispatches a
 
 ## **What's NEW!** &nbsp;<a href="#nni-released-reminder"><img width="48" src="docs/img/release_icon.png"></a>
 
-* **New release**: [v2.6 is available](https://github.com/microsoft/nni/releases/tag/v2.6) - _released on Jan-19-2022_
+* **New release**: [v2.6.1 is available](https://github.com/microsoft/nni/releases/tag/v2.6.1) - _released on Feb-18-2022_
 * **New demo available**: [Youtube entry](https://www.youtube.com/channel/UCKcafm6861B2mnYhPbZHavw) | [Bilibili 入口](https://space.bilibili.com/1649051673) - _last updated on May-26-2021_
 * **New webinar**: [Introducing Retiarii: A deep learning exploratory-training framework on NNI](https://note.microsoft.com/MSR-Webinar-Retiarii-Registration-Live.html) - _scheduled on June-24-2021_
 * **New community channel**: [Discussions](https://github.com/microsoft/nni/discussions)

README_zh_CN.md

@@ -21,7 +21,7 @@ NNI 管理自动机器学习 (AutoML) 的 Experiment，**调度运行**由调优
 
 ## **最新消息！** &nbsp;[<img width="48" src="docs/img/release_icon.png" />](#nni-released-reminder)
 
-* **最新版本**：[v2.6 已发布](https://github.com/microsoft/nni/releases/tag/v2.6) - *2022年1月19日*
+* **最新版本**：[v2.6.1 已发布](https://github.com/microsoft/nni/releases/tag/v2.6.1) - *2022年2月18日*
 * **最新视频 demo**：[Youtube 入口](https://www.youtube.com/channel/UCKcafm6861B2mnYhPbZHavw) | [Bilibili 入口](https://space.bilibili.com/1649051673) - *上次更新：2021年5月26日*
 * **最新网络研讨会**: [介绍Retiarii：NNI 上的深度学习探索性训练框架](https://note.microsoft.com/MSR-Webinar-Retiarii-Registration-Live.html) - *2021年6月24日*
 * **最新互动渠道**: [Discussions](https://github.com/microsoft/nni/discussions)

docs/en_US/Release.rst

@@ -5,6 +5,15 @@
 Change Log
 ==========
 
+Release 2.6.1 - 2/18/2022
+-------------------------
+
+Bug Fixes
+^^^^^^^^^
+
+* Fix a bug that new TPE does not support dict metrics.
+* Fix a bug that missing comma. (Thanks to @mrshu)
+
 Release 2.6 - 1/19/2022
 -----------------------
 

docs/en_US/conf.py

@@ -27,7 +27,7 @@
 # The short X.Y version
 version = ''
 # The full version, including alpha/beta/rc tags
-release = 'v2.6'
+release = 'v2.6.1'
 
 # -- General configuration ---------------------------------------------------