Updated badge in README.md

Author: rickecon

README.md

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 | Org | [![OSE Lab cataloged](https://img.shields.io/badge/OSE%20Lab-catalogued-critical)](https://github.com/OpenSourceEcon) [![OS License: AGPL-3.0](https://img.shields.io/badge/OS%20License-AGPL%203.0-yellow)](https://github.com/OpenSourceEcon/CompMethods/blob/main/LICENSE) |
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+| Testing | ![example event parameter](https://github.com/OpenSourceEcon/CompMethods/actions/workflows/build_and_test.yml/badge.svg?branch=main) ![example event parameter](https://github.com/OpenSourceEcon/CompMethods/actions/workflows/deploy_docs.yml/badge.svg?branch=main) ![example event parameter](https://github.com/OpenSourceEcon/CompMethods/actions/workflows/check_format.yml/badge.svg?branch=main) [![Codecov](https://codecov.io/gh/OpenSourceEcon/CompMethods/branch/main/graph/badge.svg)](https://codecov.io/gh/OpenSourceEcon/compmethods) |
 
 This repository contains the source material, code, and data for the book, [*Computational Methods for Economists using Python*](https://opensourceecon.github.io/CompMethods/), by Richard W. Evans (2023). This book is freely available online as an executable Jupyter Book at https://opensourceecon.github.io/CompMethods.