message: Update build from source instructions in README
  I run into issues while trying to build onnx from source because I did not checkout the submodules.
diff: @@ -84,9 +84,12 @@ You can then install ONNX from PyPi (Note: Set environment variable `ONNX_ML=1`
  pip install onnx
  ```
  -You can also build and install ONNX locally from source code (git clone https://github.com/onnx/onnx.git):
  +You can also build and install ONNX locally from source code:
  ```
  +git clone https://github.com/onnx/onnx.git
  +cd onnx
  +git submodule update --init
  python setup.py install
  ```
  