message: Use only python 3.5
diff: @@ -21,7 +21,7 @@ a variety of nGraph-enabled backends: CPU, GPU, and custom silicon like the
  1. You need to instantiate a specific kind of `virtualenv` to
  be able to proceed with the `ngraph-tf` bridge installation. For
  - systems with Python 3.n or Python 2.7, these commands are
  + systems with Python 3.5 or Python 2.7, these commands are
  virtualenv --system-site-packages -p python3 your_virtualenv
  virtualenv --system-site-packages -p /usr/bin/python2 your_virtualenv
  @@ -87,7 +87,7 @@ The installation prerequisites are the same as described in the TensorFlow
  git checkout v0.10.0-rc0
  -2. Next run the following Python script to build TensorFlow, nGraph and the bridge:
  +2. Next run the following Python script to build TensorFlow, nGraph and the bridge. Please use Python 3.5:
  python3 build_ngtf.py
  