Update README.md

Author: mdhumphries

README.md

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 Python toolbox for Bayesian analysis of behavioural strategies on choice tasks
 
-Pre-print: https://biorxiv.org/cgi/content/short/2022.08.30.505807v1
+Pre-print: https://doi.org/10.1101/2022.08.30.505807
 
 Tested with: Python 3.9 onwards