Fixing coveralls badge branch

README.md

@@ -3,7 +3,7 @@
 ![Continuous Integration Status](https://github.com/bihealth/altamisa/workflows/CI/badge.svg)
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/a853a56253604aa7ab87d2bcdcd9da51)](https://www.codacy.com/app/bihealth/altamisa?utm_source=github.com&utm_medium=referral&utm_content=bihealth/altamisa&utm_campaign=Badge_Grade)
 [![Coverage Badge](https://api.codacy.com/project/badge/Coverage/a853a56253604aa7ab87d2bcdcd9da51)](https://www.codacy.com/app/bihealth/altamisa?utm_source=github.com&utm_medium=referral&utm_content=bihealth/altamisa&utm_campaign=Badge_Coverage)
-[![Coverage Status](https://coveralls.io/repos/github/bihealth/altamisa/badge.svg?branch=coveralls)](https://coveralls.io/github/bihealth/altamisa?branch=coveralls)
+[![Coverage Status](https://coveralls.io/repos/github/bihealth/altamisa/badge.svg?branch=master)](https://coveralls.io/github/bihealth/altamisa?branch=master)
 [![Documentation Status](https://readthedocs.org/projects/altamisa/badge/?version=latest)](https://altamisa.readthedocs.io/en/latest/?badge=latest)
 [![DOI](https://joss.theoj.org/papers/10.21105/joss.01610/status.svg)](https://doi.org/10.21105/joss.01610)
 [![MIT License](https://img.shields.io/badge/License-MIT-green.svg)](https://opensource.org/licenses/MIT)