fix test badge

Author: pgleeson

README.md

@@ -34,7 +34,7 @@ It can be accessed on the Open Source Brain site at this location: http://www.op
 
 See also http://www.opensourcebrain.org/projects/hodgkin-huxley-tutorial.
 
-[![Continuous build using OMV](https://github.com/openworm/hodgkin_huxley_tutorial/actions/workflows/main.yml/badge.svg)](https://github.com/openworm/hodgkin_huxley_tutorial/actions/workflows/main.yml) [![Non OMV tests](https://github.com/openworm/hodgkin_huxley_tutorial/actions/workflows/non-omv.yml/badge.svg)](https://github.com/openworm/hodgkin_huxley_tutorial/actions/workflows/non-omv.yml)
+[![Continuous build using OMV](https://github.com/openworm/hodgkin_huxley_tutorial/actions/workflows/omv-ci.yml/badge.svg)](https://github.com/openworm/hodgkin_huxley_tutorial/actions/workflows/omv-ci.yml) [![Non OMV tests](https://github.com/openworm/hodgkin_huxley_tutorial/actions/workflows/non-omv.yml/badge.svg)](https://github.com/openworm/hodgkin_huxley_tutorial/actions/workflows/non-omv.yml)
 
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.1493456.svg)](https://doi.org/10.5281/zenodo.1493456)