message: Update tensorboard dependency to 2.2.x
  TensorBoard release:
diff: @@ -61,7 +61,7 @@ REQUIRED_PACKAGES = [
  'numpy >= 1.16.0, < 2.0',
  'opt_einsum >= 2.3.2',
  'protobuf >= 3.9.2',
  - 'tensorboard >= 2.1.0, < 2.2.0',
  + 'tensorboard >= 2.2.0, < 2.3.0',
  'tensorflow_estimator >= 2.1.0, < 2.2.0',
  'termcolor >= 1.1.0',
  'wrapt >= 1.11.1',
  