Add new token to pretrained GPT2 tokenizer
Hi! Thank you for awesome project!    
I want to add several tokens to pre-trained GPT2 tokenizer.   
Can I?
I will use "EleutherAI/gpt-neo-1.3B" tokenizer. Is there a <|||||>This should help you out: https://huggingface.co/transformers/internal/tokenization_utils.html?highlight=add_tokens#transformers.tokenization_utils_base.SpecialTokensMixin.add_tokens<|||||>Thank you! @LysandreJik 