BUG - Setup fastai 0.7 requirements for torch version

Hello,

I installed fastai .7 through the setup guide and ran into an error when I imported the libs inside one of the notebooks. Basically one of torch modules was missing. I updated torch to use the latest version and it worked.
Actually it seems to me that the torch version in the req file is 0.4 while in the read.me it says that it uses a version at least 1.x.

Dont know if someone can reproduce that.
Cheers