message: Clarify that protobuf and numpy are needed for development
diff: @@ -94,15 +94,18 @@ to run tests.
  # Development
  -During development it's convenient to install ONNX in development mode:
  -
  You will need an install of protobuf and numpy to build ONNX. One easy
  way to get these dependencies is via
  [Anaconda](https://www.anaconda.com/download/):
  ```
  -# Use conda-forge protobuf.
  +# Use conda-forge protobuf, as defaults doesn't come with protoc
  conda install -c conda-forge protobuf numpy
  +```
  +
  +During development it's convenient to install ONNX in development mode:
  +
  +```
  git clone --recursive https://github.com/onnx/onnx.git
  pip install -e onnx/
  ```
  