`distilroberta-base` link missing
## ❓ Questions & Help

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According to the current master code, link for `distilroberta-base` isn't provided. 
https://github.com/huggingface/transformers/blob/1ab8dc44b3d84ed1894f5b6a6fab58fb39298fc7/transformers/configuration_distilbert.py#L28-L33
It is located under `configuration_roberta.py`, see it [here](https://github.com/huggingface/transformers/blob/1c542df7e554a2014051dd09becf60f157fed524/transformers/configuration_roberta.py#L31) :)<|||||>Thanks @stefan-it ! Missed the readme part of calling `distilroberta-base` with `RobertaModel` instead of `DistilBertModel`. Closing. 