Merge pull request #1943 from Unity-Technologies/hotfix-gym-unity

Bumping gym_unity version

gym-unity/setup.py

 from setuptools import setup, find_packages
 
 setup(name='gym_unity',
-      version='0.4.0',
+      version='0.4.1',
       description='Unity Machine Learning Agents Gym Interface',
       license='Apache License 2.0',
       author='Unity Technologies',