Fix branch names

README.md

@@ -1,12 +1,12 @@
 -<img align="right" src="SI-logo.jpg">
 
-[![Continuous Integration](https://github.com/bernedom/SI/actions/workflows/ci.yml/badge.svg?branch=master)](https://github.com/bernedom/SI/actions?query=workflow%3ACI)
+[![Continuous Integration](https://github.com/bernedom/SI/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/bernedom/SI/actions?query=workflow%3ACI)
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/ec7f65662b91480a9968bd77bd32c66c)](https://www.codacy.com/app/bernedom/SI?utm_source=github.com&amp;utm_medium=referral&amp;utm_content=bernedom/SI&amp;utm_campaign=Badge_Grade)
-[![API Documentation](https://github.com/bernedom/SI/actions/workflows/api-doc.yml/badge.svg?branch=master)](https://si.dominikberner.ch/doc/)
-[![CodeQL](https://github.com/bernedom/SI/actions/workflows/codeql.yml/badge.svg?branch=master)](https://github.com/bernedom/SI/actions?query=workflow%3ACodeQL)
+[![API Documentation](https://github.com/bernedom/SI/actions/workflows/api-doc.yml/badge.svg?branch=main)](https://si.dominikberner.ch/doc/)
+[![CodeQL](https://github.com/bernedom/SI/actions/workflows/codeql.yml/badge.svg?branch=main)](https://github.com/bernedom/SI/actions?query=workflow%3ACodeQL)
 
 [![GitHub Releases](https://img.shields.io/github/release/bernedom/SI.svg)](https://github.com/bernedom/SI/releases)
-[![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/bernedom/SI/master/LICENSE)
+[![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/bernedom/SI/main/LICENSE)
 
 # SI - Type safety for physical units