Develop unified version (#2712)

* only read the version from 1 place

* better path

* gym version too

gym-unity/setup.py

 #!/usr/bin/env python
 
 from setuptools import setup, find_packages
+from os import path
+
+here = path.abspath(path.dirname(__file__))
+
+with open(path.join(here, "..", "VERSION")) as f:
+    version_string = f.read().strip()
-    version="0.4.7",
+    version=version_string,
     description="Unity Machine Learning Agents Gym Interface",
     license="Apache License 2.0",
     author="Unity Technologies",
-    install_requires=["gym", "mlagents_envs==0.10.1"],
+    install_requires=["gym", "mlagents_envs=={}".format(version_string)],
 )

ml-agents-envs/setup.py

 
 here = path.abspath(path.dirname(__file__))
 
+with open(path.join(here, "..", "VERSION")) as f:
+    version_string = f.read().strip()
+
-    version="0.10.1",
+    version=version_string,
     description="Unity Machine Learning Agents Interface",
     url="https://github.com/Unity-Technologies/ml-agents",
     author="Unity Technologies",

ml-agents/setup.py

 
 here = path.abspath(path.dirname(__file__))
 
+with open(path.join(here, "..", "VERSION")) as f:
+    version_string = f.read().strip()
+
 # Get the long description from the README file
 with open(path.join(here, "README.md"), encoding="utf-8") as f:
     long_description = f.read()
-    version="0.10.1",
+    version=version_string,
     description="Unity Machine Learning Agents",
     long_description=long_description,
     long_description_content_type="text/markdown",
         "h5py>=2.9.0",
         "jupyter",
         "matplotlib",
-        "mlagents_envs==0.10.1",
+        "mlagents_envs=={}".format(version_string),
         "numpy>=1.13.3,<2.0",
         "Pillow>=4.2.1",
         "protobuf>=3.6",

VERSION

+0.10.1