Updating Tutorial Link

README.md

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 # ChemBERTa
 ChemBERTa: A collection of BERT-like models applied to chemical SMILES data for drug design, chemical modelling, and property prediction. To be presented at [Baylearn](https://baylearn2020.splashthat.com/) and the [Royal Society of Chemistry's Chemical Science Symposium](https://www.rsc.org/events/detail/42791/chemical-science-symposium-2020-how-can-machine-learning-and-autonomy-accelerate-chemistry).
 
-[Tutorial](https://github.com/deepchem/deepchem/blob/master/examples/tutorials/22_Transfer_Learning_With_HuggingFace_tox21.ipynb) <br />
+[Tutorial](https://github.com/deepchem/deepchem/blob/master/examples/tutorials/Transfer_Learning_With_ChemBERTa_Transformers.ipynb) <br />
 [Arxiv Paper](https://arxiv.org/abs/2010.09885) <br />
 [Poster](https://chemsci20.ipostersessions.com/Default.aspx?s=99-39-E6-B6-B0-0E-E1-D8-FB-66-1A-44-DC-A3-43-BA) <br />
 [Abstract](https://t.co/dkA5rMvYrE?amp=1) <br />