message: Add flatbuffers python library to tensorflow pip_package
diff: @@ -54,6 +54,7 @@ _VERSION = '2.4.0'
  REQUIRED_PACKAGES = [
  'absl-py >= 0.7.0',
  'astunparse == 1.6.3',
  + 'flatbuffers >= 1.12',
  'gast == 0.3.3',
  'google_pasta >= 0.1.8',
  'h5py >= 2.10.0, < 2.11.0',
  