Update README.md

Author: dblizinski

README.md

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 # Openwater Documentation
 
 [![Deploy Documentation](https://github.com/OpenwaterHealth/openwater-docs/actions/workflows/deploy.yml/badge.svg)](https://github.com/OpenwaterHealth/openwater-docs/actions/workflows/deploy.yml)
-[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](LICENSE)
+[![License](https://img.shields.io/badge/License-AGPL--3.0-blue.svg)](LICENSE)
 
 Comprehensive documentation for Openwater's open-source medical device platforms.