update README.md

Author: bmtgoncalves

README.md

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 ![GitHub last commit](https://img.shields.io/github/last-commit/DataForScience/LLM4DS)
 
 [![Graphs For Science](https://img.shields.io/badge/Graphs_For_Science-Subscribe-blue)](https://graphs4sci.substack.com/)
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 # Large Language Models for Data Science