Modify setup file (#486)

python/setup.py

     required = f.read().splitlines()
 
 setup(name='unityagents',
-      version='0.2.0',
+      version='0.3.0',
-      packages=find_packages(exclude = ['ppo']),
+      packages=find_packages(),
       install_requires = required,
       long_description= ("Unity Machine Learning Agents allows researchers and developers "
        "to transform games and simulations created using the Unity Editor into environments "