message: Also pin on Windows
diff: @@ -28,7 +28,7 @@ SET PATH=%PATH%;C:\%PYTHON_DIRECTORY%
  %PIP_EXE% install setuptools --upgrade
  %PIP_EXE% install future>=0.17.1 --no-deps
  -%PIP_EXE% install tf-estimator-nightly --no-deps
  +%PIP_EXE% install tf-estimator-nightly==2.1.0.dev2020031101 --no-deps
  %PIP_EXE% install tb-nightly --no-deps
  %PIP_EXE% install numpy==1.18.5 --upgrade --no-deps
  %PIP_EXE% install opt_einsum --upgrade
  