2018-04-16 Build onnx for WindowsΒΆ

onnx is not necessarily up to date on PyPI. To get the latest version, the simplest is to clone the project on github and set up a build like this one on appveyor. But before that, you need to mofiy file appveyor.yml and a section for artifacts:

artifacts:
  - path: '*.whl'
    name: onnx