com.unity.ml-agents 1.3.0-preview Package Notes

#### com.unity.ml-agents (C#)
Academy.EnvironmentStep() will now throw an exception if it is called
recursively (for example, by an Agent's CollectObservations method).
Previously, this would result in an infinite loop and cause the editor to hang.
(#4226)
#### ml-agents / ml-agents-envs / gym-unity (Python)
The algorithm used to normalize observations was introducing NaNs if the initial observations were too large
due to incorrect initialization. The initialization was fixed and is now the observation means from the
first trajectory processed. (#4299)

com.unity.ml-agents 1.3.0-preview