message: Update pasta dependency to 0.1.6.
  Fixes parsing problems with naked * in function definitions.
diff: @@ -53,7 +53,7 @@ REQUIRED_PACKAGES = [
  'absl-py >= 0.7.0',
  'astor >= 0.6.0',
  'gast >= 0.2.0',
  - 'google_pasta >= 0.1.2',
  + 'google_pasta >= 0.1.6',
  'keras_applications >= 1.0.6',
  'keras_preprocessing >= 1.0.5',
  'numpy >= 1.14.5, < 2.0',
  