More flexibility on the h5py version

ml-agents/setup.py

         "pyyaml",
         "protobuf>=3.6,<3.7",
         "grpcio>=1.11.0,<1.12.0",
-        "h5py==2.9.0",
+        "h5py>=2.9.0",
         'pypiwin32==223;platform_system=="Windows"',
     ],
     python_requires=">=3.6,<3.7",