message: Build with old version protobuf on Windows
diff: @@ -35,7 +35,7 @@ install:
  before_build:
  - cmd: SET PATH=%CONDA_PREFIX%;%CONDA_PREFIX%\Scripts;%PATH%
  -- cmd: conda install -y -c conda-forge protobuf numpy
  +- cmd: conda install -y -c conda-forge protobuf=3.5.2 numpy
  - cmd: pip install pytest-cov nbval
  build_script:
  