Add total downloads badge

README.md

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 PySR is built on an extremely optimized pure-Julia backend, and uses regularized evolution, simulated annealing, and gradient-free optimization to search for equations that fit your data.
 
-| **Docs** | **pip** |
-|---|---|
-|[![Documentation](https://github.com/MilesCranmer/PySR/actions/workflows/docs.yml/badge.svg)](https://astroautomata.com/PySR/)|[![PyPI version](https://badge.fury.io/py/pysr.svg)](https://badge.fury.io/py/pysr)|
+| **Docs** | **pip** | **stats** |
+|---|---|---|
+|[![Documentation](https://github.com/MilesCranmer/PySR/actions/workflows/docs.yml/badge.svg)](https://astroautomata.com/PySR/)|[![PyPI version](https://badge.fury.io/py/pysr.svg)](https://badge.fury.io/py/pysr)|[![Downloads](https://pepy.tech/badge/pysr)](https://pepy.tech/badge/pysr)|
 
 
 (pronounced like *py* as in python, and then *sur* as in surface)