minor minor request about matplotlib

[Ryoo72]

Matplotlib is additionally required to run prepare_cifar10.sh

It would be nice if 'pip install matplotlib' is added to the list.

• conda install pytorch torchvision torchaudio cudatoolkit=10.2 -c pytorch
• conda install -c pytorch faiss-gpu
• conda install -c anaconda scipy
• conda install -c conda-forge tqdm
• pip install torchnet
• pip install matplotlib

[psellcam]

Thank you for the comment, will add it now.