updating readme badges

Author: bmcfee

README.md

@@ -3,7 +3,7 @@ jams
 [![PyPI](https://img.shields.io/pypi/v/jams.svg)](https://pypi.python.org/pypi/jams)
 [![License](https://img.shields.io/pypi/l/jams.svg)](https://github.com/marl/jams/blob/master/LICENSE.md)
 [![Tests](https://github.com/marl/jams/actions/workflows/ci.yml/badge.svg)](https://github.com/marl/jams/actions/workflows/ci.yml)
-[![Coverage Status](https://coveralls.io/repos/marl/jams/badge.svg?branch=master)](https://coveralls.io/r/marl/jams?branch=master)
+[![codecov](https://codecov.io/gh/marl/jams/graph/badge.svg?token=dRCLnaNTTO)](https://codecov.io/gh/marl/jams)
 [![Dependency Status](https://dependencyci.com/github/marl/jams/badge)](https://dependencyci.com/github/marl/jams)
 
 A JSON Annotated Music Specification for Reproducible MIR Research.