fix cd badge in readme

Author: janfb

README.md

@@ -1,7 +1,7 @@
 [![PyPI version](https://badge.fury.io/py/sbi.svg)](https://badge.fury.io/py/sbi)
 [![Conda Version](https://img.shields.io/conda/vn/conda-forge/sbi.svg)](https://github.com/conda-forge/sbi-feedstock)
 [![Contributions welcome](https://img.shields.io/badge/contributions-welcome-brightgreen.svg?style=flat)](https://sbi.readthedocs.io/en/latest/contributing.html)
-[![Tests](https://github.com/sbi-dev/sbi/actions/workflows/ci.yml/badge.svg)](https://github.com/sbi-dev/sbi/actions)
+[![Tests](https://github.com/sbi-dev/sbi/actions/workflows/cd.yml/badge.svg)](https://github.com/sbi-dev/sbi/actions)
 [![codecov](https://codecov.io/gh/sbi-dev/sbi/branch/main/graph/badge.svg)](https://codecov.io/gh/sbi-dev/sbi)
 [![GitHub license](https://img.shields.io/github/license/sbi-dev/sbi)](https://github.com/sbi-dev/sbi/blob/master/LICENSE.txt)
 [![DOI](https://joss.theoj.org/papers/10.21105/joss.07754/status.svg)](https://doi.org/10.21105/joss.07754)