Reference to Bertin limitations.

README.md

@@ -46,7 +46,7 @@ Please, refer to [this training run](https://wandb.ai/readability-es/readability
 - One of the datasets involved is the Spanish version of newsela, which is frequently used as a reference. However, it was created by translating previous datasets, and therefore it may contain somewhat unnatural phrases.
 - Some of the datasets used cannot be publicly disseminated, making it more difficult to assess the existence of biases or mistakes.
 - Language might be biased towards the Spanish dialect spoken in Spain. Other regional variants might be sub-represented.
-- In-depth examinations of other limitations and biases have not yet been carried out.
+- No effort has been performed to alleviate the shortcomings and biases described in the [original implementation of BERTIN](https://huggingface.co/bertin-project/bertin-roberta-base-spanish#bias-examples-spanish).
 
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