message: Adding `six` version requirement to setup.py.oss.
diff: @@ -73,6 +73,7 @@ REQUIRED_PACKAGES = [
  'mock >= 2.0.0;python_version<"3"',
  # functools comes with python3, need to install the backport for python2
  'functools32 >= 3.2.3;python_version<"3"',
  + 'six >= 1.12.0',
  ]
  if sys.byteorder == 'little':
  