Update README.md

README.md

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 The model was pretrained on approximately 400 billion tokens and achieves state-of-the-art performance across several benchmarks designed to evaluate Portuguese language models. **All data, source code, and recipes used to develop the Tucano2 series are open and fully reproducible.**
 
-Read our preprint [here](https://arxiv.org/abs/XXXX.XXXXX) to learn more about the Tucano2 series.
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 ## Details
 
 - **Architecture:** a Transformer-based model ([`llama`](https://huggingface.co/docs/transformers/main/en/model_doc/llama))