[release_16] Update readme and readme table (#5252)

Author: Ervin T

README.md

@@ -68,16 +68,15 @@ under active development and may be unstable. A few helpful guidelines:
 | **Version** | **Release Date** | **Source** | **Documentation** | **Download** | **Python Package** | **Unity Package** |
 |:-------:|:------:|:-------------:|:-------:|:------------:|:------------:|:------------:|
 | **main (unstable)** | -- | [source](https://github.com/Unity-Technologies/ml-agents/tree/main) | [docs](https://github.com/Unity-Technologies/ml-agents/tree/main/docs/Readme.md) | [download](https://github.com/Unity-Technologies/ml-agents/archive/main.zip) | -- | -- |
-| **Release 15** | **March 17, 2021** | **[source](https://github.com/Unity-Technologies/ml-agents/tree/release_15)** | **[docs](https://github.com/Unity-Technologies/ml-agents/tree/release_15_docs/docs/Readme.md)** | **[download](https://github.com/Unity-Technologies/ml-agents/archive/release_15.zip)** | **[0.25.0](https://pypi.org/project/mlagents/0.25.0/)** | **[1.9.0](https://docs.unity3d.com/Packages/com.unity.ml-agents@1.9/manual/index.html)** |
+| **Release 16** | **April 13, 2021** | **[source](https://github.com/Unity-Technologies/ml-agents/tree/release_16)** | **[docs](https://github.com/Unity-Technologies/ml-agents/tree/release_16_docs/docs/Readme.md)** | **[download](https://github.com/Unity-Technologies/ml-agents/archive/release_16.zip)** | **[0.25.1](https://pypi.org/project/mlagents/0.25.1/)** | **[1.9.1](https://docs.unity3d.com/Packages/com.unity.ml-agents@1.9/manual/index.html)** |
+| **Release 15** | March 17, 2021 | [source](https://github.com/Unity-Technologies/ml-agents/tree/release_15) | [docs](https://github.com/Unity-Technologies/ml-agents/tree/release_15_docs/docs/Readme.md) | [download](https://github.com/Unity-Technologies/ml-agents/archive/release_15.zip) | [0.25.0](https://pypi.org/project/mlagents/0.25.0/) | [1.9.0](https://docs.unity3d.com/Packages/com.unity.ml-agents@1.9/manual/index.html) |
 | **Verified Package 1.0.7** | **March 8, 2021** | **[source](https://github.com/Unity-Technologies/ml-agents/tree/com.unity.ml-agents_1.0.7)** | **[docs](https://github.com/Unity-Technologies/ml-agents/blob/release_2_verified_docs/docs/Readme.md)** | **[download](https://github.com/Unity-Technologies/ml-agents/archive/com.unity.ml-agents_1.0.7.zip)** | **[0.16.1](https://pypi.org/project/mlagents/0.16.1/)** | **[1.0.7](https://docs.unity3d.com/Packages/com.unity.ml-agents@1.0/manual/index.html)** |
 | **Release 14** | March 5, 2021 | [source](https://github.com/Unity-Technologies/ml-agents/tree/release_14) | [docs](https://github.com/Unity-Technologies/ml-agents/tree/release_14_docs/docs/Readme.md) | [download](https://github.com/Unity-Technologies/ml-agents/archive/release_14.zip) | [0.24.1](https://pypi.org/project/mlagents/0.24.1/) | [1.8.1](https://docs.unity3d.com/Packages/com.unity.ml-agents@1.8/manual/index.html) |
 | **Release 13** | February 17, 2021 | [source](https://github.com/Unity-Technologies/ml-agents/tree/release_13) | [docs](https://github.com/Unity-Technologies/ml-agents/tree/release_13_docs/docs/Readme.md) | [download](https://github.com/Unity-Technologies/ml-agents/archive/release_13.zip) | [0.24.0](https://pypi.org/project/mlagents/0.24.0/) | [1.8.0](https://docs.unity3d.com/Packages/com.unity.ml-agents@1.8/manual/index.html) |
 | **Release 12** | December 22, 2020 | [source](https://github.com/Unity-Technologies/ml-agents/tree/release_12) | [docs](https://github.com/Unity-Technologies/ml-agents/tree/release_12_docs/docs/Readme.md) | [download](https://github.com/Unity-Technologies/ml-agents/archive/release_12.zip) | [0.23.0](https://pypi.org/project/mlagents/0.23.0/) | [1.7.2](https://docs.unity3d.com/Packages/com.unity.ml-agents@1.7/manual/index.html) |
 | **Release 11** | December 21, 2020 | [source](https://github.com/Unity-Technologies/ml-agents/tree/release_11) | [docs](https://github.com/Unity-Technologies/ml-agents/tree/release_11_docs/docs/Readme.md) | [download](https://github.com/Unity-Technologies/ml-agents/archive/release_11.zip) | [0.23.0](https://pypi.org/project/mlagents/0.23.0/) | [1.7.0](https://docs.unity3d.com/Packages/com.unity.ml-agents@1.7/manual/index.html) |
 | **Release 10** | November 18, 2020 | [source](https://github.com/Unity-Technologies/ml-agents/tree/release_10) | [docs](https://github.com/Unity-Technologies/ml-agents/tree/release_10_docs/docs/Readme.md) | [download](https://github.com/Unity-Technologies/ml-agents/archive/release_10.zip) | [0.22.0](https://pypi.org/project/mlagents/0.22.0/) | [1.6.0](https://docs.unity3d.com/Packages/com.unity.ml-agents@1.6/manual/index.html) |
 | **Verified Package 1.0.6** | November 16, 2020 | [source](https://github.com/Unity-Technologies/ml-agents/tree/com.unity.ml-agents_1.0.6) | [docs](https://github.com/Unity-Technologies/ml-agents/blob/release_2_verified_docs/docs/Readme.md) | [download](https://github.com/Unity-Technologies/ml-agents/archive/com.unity.ml-agents_1.0.6.zip) | [0.16.1](https://pypi.org/project/mlagents/0.16.1/) | [1.0.6](https://docs.unity3d.com/Packages/com.unity.ml-agents@1.0/manual/index.html) |
-| **Release 9** | November 4, 2020 | [source](https://github.com/Unity-Technologies/ml-agents/tree/release_9) | [docs](https://github.com/Unity-Technologies/ml-agents/tree/release_9_docs/docs/Readme.md) | [download](https://github.com/Unity-Technologies/ml-agents/archive/release_9.zip) | [0.21.1](https://pypi.org/project/mlagents/0.21.1/) | [1.5.0](https://docs.unity3d.com/Packages/com.unity.ml-agents@1.5/manual/index.html) |
-| **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) | [0.21.0](https://pypi.org/project/mlagents/0.21.0/) | [1.5.0](https://docs.unity3d.com/Packages/com.unity.ml-agents@1.5/manual/index.html) |
 
 If you are a researcher interested in a discussion of Unity as an AI platform,
 see a pre-print of our

utils/make_readme_table.py

@@ -132,6 +132,8 @@ def pypi_link(self):
     ReleaseInfo("release_12", "1.7.2", "0.23.0", "December 22, 2020"),
     ReleaseInfo("release_13", "1.8.0", "0.24.0", "February 17, 2021"),
     ReleaseInfo("release_14", "1.8.1", "0.24.1", "March 5, 2021"),
+    ReleaseInfo("release_15", "1.9.0", "0.25.0", "March 17, 2021"),
+    ReleaseInfo("release_16", "1.9.1", "0.25.1", "April 13, 2021"),
     # Verified releases
     ReleaseInfo("", "1.0.7", "0.16.1", "March 8, 2021", is_verified=True),
     ReleaseInfo("", "1.0.6", "0.16.1", "November 16, 2020", is_verified=True),