Update `torchaudio` to 0.9 for `tensorflow-gpu` compatibility (facebo…

…okresearch#43)

* Update `torchaudio` to 0.9 for `tensorflow-gpu` compatibility

Summary:
As called out in facebookresearch#28, there are some conflicting dependencies between `torchaudio`/`torch` 0.8.1/1.8.1 and `tensorflow-gpu`.

However, as discovered in pytorch/audio#1595, upgrading to v0.9 etc actually resolve this issue.

Thus, I update the torchaudio/torch versions in our `requirements.txt` and I also updated our `numpy` requirement so there are no conflicting dependencies between `tf-gpu` and `augly` :)

I verified on my side that all unit tests still pass and that `setup.py` finishes as expected with no errors. I also update `setup.py` to add our README to our PyPI page.

Differential Revision: D29292956

fbshipit-source-id: e07f8b3d6d2d8bc9b21af166307f2ae00dbca663

* Update setup.py

Co-authored-by: Zoe Papakipos <[email protected]>