- reworded a lot of the explanations
- fixed a lot of typos
- updated some images and moved new ones to assets folder
- fixed deterministic evaluation with `torch.backends.cudnn.deterministic = True`
- tensor_type in Fields becomes dtype
- changed train, valid, test TorchText dataset objects to be named train_data, valid_data and test_data
- TorchText iterators now have `repeat = False` by default, so removed
- TorchText iterators now take a `torch.device` instead of an int representing the GPU number (and -1 for CPU)
- `F.sigmoid` is now `torch.sigmoid`
- padding sentences in the CNN model is now fixed (before spaCy would tokenize the <pad> token into three separate tokens)
