

TITLE
Add compatibility for Postponed Evaluation of Annotations (PEP 563)

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Hello,

The code says that it will add compatibility for Postponed Evaluation of Annotations ([PEP 563](https://www.python.org/dev/peps/pep-0563/)) when Python 3.9 is released (which already happened on 2020.10.5). Is there any plan to complete this?

https://github.com/huggingface/transformers/blob/2c2a31ffbcfe03339b1721348781aac4fc05bc5e/src/transformers/hf_argparser.py#L85-L90