message: Update to use python version explicitly
diff: @@ -19,7 +19,7 @@ set -e -x
  # docker run -i -t --rm -v $PWD:/v -w /v --net=host buildpack-deps:14.04 /v/.travis/python.release.sh
  export TENSORFLOW_INSTALL="$(python setup.py --package-version)"
  -export PYTHON_VERSION="python python3 python3.5 python3.6"
  +export PYTHON_VERSION="python2.7 python3.4 python3.5 python3.6"
  if [[ "$#" -gt 0 ]]; then
  export TENSORFLOW_INSTALL="${1}"
  shift
  