docs: update README.md

Author: allcontributors[bot]

README.md

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+[![All Contributors](https://img.shields.io/badge/all_contributors-2-orange.svg?style=flat-square)](#contributors-)
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 # DES RAP Book: Reproducible Discrete-Event Simulation in Python and R
@@ -192,7 +192,8 @@ Thanks goes to all of the following people ([emoji key](https://allcontributors.
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-      <td align="center" valign="top" width="14.28%"><a href="https://github.com/amyheather"><img src="https://avatars.githubusercontent.com/u/92166537?v=4?s=100" width="100px;" alt="Amy Heather"/><br /><sub><b>Amy Heather</b></sub></a><br /><a href="https://github.com/pythonhealthdatascience/des_rap_book/issues?q=author%3Aamyheather" title="Bug reports">🐛</a> <a href="https://github.com/pythonhealthdatascience/des_rap_book/commits?author=amyheather" title="Code">💻</a> <a href="#content-amyheather" title="Content">🖋</a> <a href="https://github.com/pythonhealthdatascience/des_rap_book/commits?author=amyheather" title="Documentation">📖</a> <a href="#design-amyheather" title="Design">🎨</a> <a href="#ideas-amyheather" title="Ideas, Planning, & Feedback">🤔</a> <a href="#infra-amyheather" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a> <a href="#tutorial-amyheather" title="Tutorials">✅</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/amyheather"><img src="https://avatars.githubusercontent.com/u/92166537?v=4?s=100" width="100px;" alt="Amy Heather"/><br /><sub><b>Amy Heather</b></sub></a><br /><a href="#bug-amyheather" title="Bug reports">🐛</a> <a href="#code-amyheather" title="Code">💻</a> <a href="#content-amyheather" title="Content">🖋</a> <a href="#doc-amyheather" title="Documentation">📖</a> <a href="#design-amyheather" title="Design">🎨</a> <a href="#ideas-amyheather" title="Ideas, Planning, & Feedback">🤔</a> <a href="#infra-amyheather" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a> <a href="#tutorial-amyheather" title="Tutorials">✅</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://experts.exeter.ac.uk/19244-thomas-monks"><img src="https://avatars.githubusercontent.com/u/881493?v=4?s=100" width="100px;" alt="Tom Monks"/><br /><sub><b>Tom Monks</b></sub></a><br /><a href="#review-TomMonks" title="Reviewed Pull Requests">👀</a></td>
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