Update README.md

Author: mdhumphries

README.md

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 # Bayesian_Strategy_Analysis_MATLAB
 MATLAB toolbox for Bayesian analysis of behavioural strategies on choice tasks
 
+Pre-print: https://biorxiv.org/cgi/content/short/2022.08.30.505807v1
+
 Tested with: MATLAB R2017a onwards
 Requires: Statistics and Machine Learning Toolbox
 
-[reference to pre-print to go here]
-
 ## Top-level scripts
 Four scripts demonstrate the main use of the Toolbox:
 1. Demonstrate_Bayesian_strategy_analysis.m: shows how to run the algorithm for a single strategy model