message: Fix the version string in setup.py. The PR seemed to miss it.
diff: @@ -45,7 +45,7 @@ DOCLINES = __doc__.split('\n')
  # This version string is semver compatible, but incompatible with pip.
  # For pip, we will remove all '-' characters from this string, and use the
  # result for pip.
  -_VERSION = '1.9.0-rc0'
  +_VERSION = '1.9.0'
  REQUIRED_PACKAGES = [
  'absl-py >= 0.1.6',
  