update com.unity.ml-agents.extensions to Apache 2.0 license (#4223) (#4225)

com.unity.ml-agents.extensions/LICENSE.md

 com.unity.ml-agents.extensions copyright © 2020 Unity Technologies ApS
 
-Licensed under the Unity Companion License for Unity-dependent projects -- see
-[Unity Companion License](http://www.unity3d.com/legal/licenses/Unity_Companion_License).
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
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+   Copyright 2017 Unity Technologies
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