Update README.md

arxiv paper version corrected

README.md

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 This repository contains the reference implementation for the Tensor Sketching method, which can be used to estimate sequence similarity without needing to align the sequences.
 
 The method is described in the paper by Amir Joudaki et al. [`Fast Alignment-Free Similarity Estimation By Tensor
- Sketching`](https://www.biorxiv.org/content/10.1101/2020.11.13.381814v1.full).
+ Sketching`](https://www.biorxiv.org/content/10.1101/2020.11.13.381814v5.full).
 
 ## Download and build
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