Update README.md

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README.md

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  <b>Topic modeling is your turf too.</b> <br> <i> Contextual topic models with representations from transformers. </i></p>
 
+ [![DOI](https://joss.theoj.org/papers/10.21105/joss.08183/status.svg)](https://doi.org/10.21105/joss.08183)
 
 ## Features
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