Update README.md

Author: vboutrou

README.md

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 [![View on File Exchange](https://www.mathworks.com/matlabcentral/images/matlab-file-exchange.svg)](https://www.mathworks.com/matlabcentral/fileexchange/123265-treasure-hunt) or [![Open in MATLAB Online](https://www.mathworks.com/images/responsive/global/open-in-matlab-online.svg)](https://matlab.mathworks.com/open/github/v1?repo=MathWorks-Teaching-Resources/Treasure-Hunt&project=TreasureHunt.prj&file=README.mlx)
 
 [![MATLAB Versions Tested](https://img.shields.io/endpoint?url=https://mathworks-teaching-resources.github.io/Treasure-Hunt/TestedWith.json)](https://MathWorks-Teaching-Resources.github.io/Treasure-Hunt)
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 **Curriculum Module**
 
 _Created with R2022b. Compatible with R2024a and later releases._