release note draft for v0.9 (#1232)

* release note draft for v0.9

* change version number in readme

* update release

* update release note

* update release note for webui and nnictl

* update MP notes

README.md

@@ -17,7 +17,7 @@
 NNI (Neural Network Intelligence) is a toolkit to help users run automated machine learning (AutoML) experiments.
 The tool dispatches and runs trial jobs generated by tuning algorithms to search the best neural architecture and/or hyper-parameters in different environments like local machine, remote servers and cloud.
 
-### **NNI [v0.8](https://github.com/Microsoft/nni/releases) has been released!**
+### **NNI [v0.9](https://github.com/Microsoft/nni/releases) has been released!**
 <p align="center">
   <a href="#nni-v05-has-been-released"><img src="docs/img/overview.svg" /></a>
 </p>
@@ -138,7 +138,7 @@ Linux and MacOS
 * Run the following commands in an environment that has `python >= 3.5`, `git` and `wget`.
 
 ```bash
-    git clone -b v0.8 https://github.com/Microsoft/nni.git
+    git clone -b v0.9 https://github.com/Microsoft/nni.git
     cd nni
     source install.sh
 ```
@@ -148,7 +148,7 @@ Windows
 * Run the following commands in an environment that has `python >=3.5`, `git` and `PowerShell`
 
 ```bash
-  git clone -b v0.8 https://github.com/Microsoft/nni.git
+  git clone -b v0.9 https://github.com/Microsoft/nni.git
   cd nni
   powershell -ExecutionPolicy Bypass -file install.ps1
 ```
@@ -164,7 +164,7 @@ The following example is an experiment built on TensorFlow. Make sure you have *
 * Download the examples via clone the source code.
 
 ```bash
-    git clone -b v0.8 https://github.com/Microsoft/nni.git
+    git clone -b v0.9 https://github.com/Microsoft/nni.git
 ```
 
 Linux and MacOS

README_zh_CN.md

@@ -10,7 +10,7 @@
 
 NNI (Neural Network Intelligence) 是自动机器学习（AutoML）的工具包。 它通过多种调优的算法来搜索最好的神经网络结构和（或）超参，并支持单机、本地多机、云等不同的运行环境。
 
-### **NNI [v0.8](https://github.com/Microsoft/nni/releases) 已发布！**
+### **NNI [v0.9](https://github.com/Microsoft/nni/releases) 已发布！**
 
 <p align="center">
   <a href="#nni-v05-has-been-released"><img src="docs/img/overview.svg" /></a>

docs/en_US/Release.md

 # ChangeLog
 
+## Release 0.9 - 7/1/2019
+
+### Major Features
+* General NAS programming interface
+    * Add `enas-mode`  and `oneshot-mode` for NAS interface: [PR #1201](https://github.com/microsoft/nni/pull/1201#issue-291094510)
+* [Gaussian Process Tuner with Matern kernel](./GPTuner.md) 
+
+* Multiphase experiment supports
+    * Added new training service support for multiphase experiment: PAI mode supports multiphase experiment since v0.9.
+    * Added multiphase capability for the following builtin tuners: 
+        * TPE, Random Search, Anneal, Naïve Evolution, SMAC, Network Morphism, Metis Tuner.
+    
+    For details, please refer to [Write a tuner that leverages multi-phase](./MultiPhase.md#write-a-tuner-that-leverages-multi-phase)
+
+* Web Portal
+    * Enable trial comparation in Web Portal. For details, refer to [View trials status](WebUI.md#view-trials-status)
+    * Allow users to adjust rendering interval of Web Portal. For details, refer to [View Summary Page](WebUI.md#view-summary-page)
+    * show intermediate results more friendly. For details, refer to [View trials status](WebUI.md#view-trials-status)
+* [Commandline Interface](Nnictl.md)
+    * `nnictl experiment delete`: delete one or all experiments, it includes log, result, environment information and cache. It uses to delete useless experiment result, or save disk space.
+    * `nnictl platform clean`: It uses to clean up disk on a target platform. The provided YAML file includes the information of target platform, and it follows the same schema as the NNI configuration file.
+### Bug fix and other changes
+* Tuner Installation Improvements: add [sklearn](https://scikit-learn.org/stable/) to nni dependencies.
+* (Bug Fix) Failed to connect to PAI http code - [Issue #1076](https://github.com/microsoft/nni/issues/1076)
+* (Bug Fix) Validate file name for PAI platform - [Issue #1164](https://github.com/microsoft/nni/issues/1164)
+* (Bug Fix) Update GMM evaluation in Metis Tuner
+* (Bug Fix) Negative time number rendering in Web Portal - [Issue #1182](https://github.com/microsoft/nni/issues/1182), [Issue #1185](https://github.com/microsoft/nni/issues/1185)
+* (Bug Fix) Hyper-parameter not shown correctly in WebUI when there is only one hyper parameter - [Issue #1192](https://github.com/microsoft/nni/issues/1192)
+
 ## Release 0.8 - 6/4/2019
 
 ### Major Features