Update README.md

Author: sbryngelson

README.md

@@ -9,7 +9,7 @@
     <img src="https://zenodo.org/badge/doi/10.1016/j.cpc.2020.107396.svg" />
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   <a href="https://github.com/MFlowCode/MFC/actions">
-    <img src="https://github.com/MFlowCode/MFC/actions/workflows/ci.yml/badge.svg" />
+    <img src="https://github.com/MFlowCode/MFC/actions/workflows/test.yml/badge.svg" />
   </a>
   <a href="https://lbesson.mit-license.org/">
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