message: BigtableClient requires TF 1.11+
diff: @@ -87,11 +87,11 @@ pip3 install -r requirements.txt
  Then, you'll need to choose to install the GPU or CPU tensorflow requirements:
  -- GPU: `pip3 install "tensorflow-gpu>=1.9,<1.10"`.
  +- GPU: `pip3 install "tensorflow-gpu>=1.11,<1.12"`.
  - *Note*: You must install [CUDA
  9.0](https://developer.nvidia.com/cuda-90-download-archive). for Tensorflow
  1.5+.
  -- CPU: `pip3 install "tensorflow>=1.9,<1.10"`.
  +- CPU: `pip3 install "tensorflow>=1.11,<1.12"`.
  Setting up the Environment
  --------------------------
  