Update README.md

Author: gsheni

README.md

@@ -5,7 +5,7 @@
 </p>
 
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+[![Unit Tests](https://github.com/datacebo/PyMetrics/actions/workflows/unit.yaml/badge.svg)](https://github.com/datacebo/PyMetrics/actions/workflows/unit.yaml?query=branch%3Amain)
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