Update README.md

Author: chkr1011

README.md

@@ -3,7 +3,7 @@
 </p>
 
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-[![CI](https://img.shields.io/github/workflow/status/chkr1011/mqttMultimeter/CI/main)](https://github.com/chkr1011/mqttMultimeter/actions/workflows/ci.yml)
+[![CI](https://github.com/chkr1011/mqttMultimeter/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/chkr1011/mqttMultimeter/actions/workflows/ci.yml)
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