[Release 8] update release table (#4551)

Author: Ruo-Ping (Rachel) Dong

README.md

@@ -48,7 +48,7 @@ descriptions of all these features.
 
 ## Releases & Documentation
 
-**Our latest, stable release is `Release 7`. Click
+**Our latest, stable release is `Release 8`. Click
 [here](https://github.com/Unity-Technologies/ml-agents/tree/release_8_docs/docs/Readme.md)
 to get started with the latest release of ML-Agents.**
 
@@ -67,13 +67,13 @@ under active development and may be unstable. A few helpful guidelines:
 | **Version** | **Release Date** | **Source** | **Documentation** | **Download** |
 |:-------:|:------:|:-------------:|:-------:|:------------:|
 | **master (unstable)** | -- | [source](https://github.com/Unity-Technologies/ml-agents/tree/master) | [docs](https://github.com/Unity-Technologies/ml-agents/tree/master/docs/Readme.md) | [download](https://github.com/Unity-Technologies/ml-agents/archive/master.zip) |
-| **Release 7** | **September 16, 2020** | **[source](https://github.com/Unity-Technologies/ml-agents/tree/release_7)** | **[docs](https://github.com/Unity-Technologies/ml-agents/tree/release_7_docs/docs/Readme.md)** | **[download](https://github.com/Unity-Technologies/ml-agents/archive/release_7.zip)** |
+| **Release 8** | **October 14, 2020** | **[source](https://github.com/Unity-Technologies/ml-agents/tree/release_8)** | **[docs](https://github.com/Unity-Technologies/ml-agents/tree/release_8_docs/docs/Readme.md)** | **[download](https://github.com/Unity-Technologies/ml-agents/archive/release_8.zip)** |
+| **Release 7** | September 16, 2020 | [source](https://github.com/Unity-Technologies/ml-agents/tree/release_7) | [docs](https://github.com/Unity-Technologies/ml-agents/tree/release_7_docs/docs/Readme.md) | [download](https://github.com/Unity-Technologies/ml-agents/archive/release_7.zip) |
 | **Release 6** | August 12, 2020 | [source](https://github.com/Unity-Technologies/ml-agents/tree/release_6) | [docs](https://github.com/Unity-Technologies/ml-agents/tree/release_6_docs/docs/Readme.md) | [download](https://github.com/Unity-Technologies/ml-agents/archive/release_6.zip) |
 | **Release 5** | July 31, 2020 | [source](https://github.com/Unity-Technologies/ml-agents/tree/release_5) | [docs](https://github.com/Unity-Technologies/ml-agents/tree/release_5_docs/docs/Readme.md) | [download](https://github.com/Unity-Technologies/ml-agents/archive/release_5.zip) |
 | **Release 4** | July 15, 2020 | [source](https://github.com/Unity-Technologies/ml-agents/tree/release_4) | [docs](https://github.com/Unity-Technologies/ml-agents/tree/release_4_docs/docs/Readme.md) | [download](https://github.com/Unity-Technologies/ml-agents/archive/release_4.zip) |
 | **Release 3** | June 10, 2020 | [source](https://github.com/Unity-Technologies/ml-agents/tree/release_3) | [docs](https://github.com/Unity-Technologies/ml-agents/tree/release_3_docs/docs/Readme.md) | [download](https://github.com/Unity-Technologies/ml-agents/archive/release_3.zip) |
 | **Release 2** | May 20, 2020 | [source](https://github.com/Unity-Technologies/ml-agents/tree/release_2) | [docs](https://github.com/Unity-Technologies/ml-agents/tree/release_2_docs/docs/Readme.md) | [download](https://github.com/Unity-Technologies/ml-agents/archive/release_2.zip) |
-| **Release 1** | April 30, 2020 | [source](https://github.com/Unity-Technologies/ml-agents/tree/release_1) | [docs](https://github.com/Unity-Technologies/ml-agents/tree/release_1_docs/docs/Readme.md) | [download](https://github.com/Unity-Technologies/ml-agents/archive/release_1.zip) |
 
 ## Citation
 

com.unity.ml-agents/CHANGELOG.md

@@ -6,20 +6,6 @@ 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).
 
-## [Unreleased]
-
-### Major Changes
-#### com.unity.ml-agents (C#)
-#### ml-agents / ml-agents-envs / gym-unity (Python)
-
-### Minor Changes
-#### com.unity.ml-agents (C#)
-#### ml-agents / ml-agents-envs / gym-unity (Python)
-
-### Bug Fixes
-#### com.unity.ml-agents (C#)
-#### ml-agents / ml-agents-envs / gym-unity (Python)
-
 
 ## [1.5.0-preview] - 2020-10-14
 ### Major Changes

utils/make_readme_table.py

@@ -73,6 +73,7 @@ def display_name(self) -> str:
     ReleaseInfo("release_5", "1.2.1", "0.18.1", "July 31, 2020"),
     ReleaseInfo("release_6", "1.3.0", "0.19.0", "August 12, 2020"),
     ReleaseInfo("release_7", "1.4.0", "0.20.0", "September 16, 2020"),
+    ReleaseInfo("release_8", "1.5.0", "0.21.0", "October 14, 2020"),
 ]
 
 MAX_DAYS = 150  # do not print releases older than this many days