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README.md

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-[DistilGPT2 English language model](https://huggingface.co/distilgpt2) fine-tuned on mathematical proofs extracted from LaTeX sources on [arXiv.org](https://arxiv.org).
+[DistilGPT2](https://huggingface.co/distilgpt2)  English language model fine-tuned on mathematical proofs extracted from LaTeX  [arXiv.org](https://arxiv.org) from 1992-2020.
 
  Proofs have been cleaned up a bit. In particular, they use:
  * `CITE` for any citation