Use condat to install torchvision(-cpu)

Created by: metal3d

Hi, In the readme, you say to use "pip install torchvision" but actually everything can be done with "conda":

For cpu:

conda install pytorch-cpu=0.4.1 torchvision-cpu -c pytorch

For Gpu:

conda install pytorch=0.4.1 torchvision -c pytorch

Nice work !