message: Update README to add clarification
diff: @@ -17,6 +17,9 @@ a variety of nGraph-enabled backends: CPU, GPU, and custom silicon like the
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  +
  +#### *** This repository is currently undergoing heavy refactoring for optimization of inference use-cases. If you are looking for the latest stable baseline, please use the following tag: v0.22.0-rc4 (https://github.com/tensorflow/ngraph-bridge/tree/v0.22.0-rc4) ***
  +
  ## Installation
  ### Software requirements
  @@ -43,7 +46,7 @@ a variety of nGraph-enabled backends: CPU, GPU, and custom silicon like the
  2. Install TensorFlow:
  - pip install -U tensorflow==2.2.0
  + pip install -U tensorflow==1.14.0
  3. Install `ngraph-tensorflow-bridge`:
  