Update README.md

Author: maxfriedmann

README.md

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-<a href="https://codeclimate.com/github/smallstack/utils/test_coverage"><img src="https://api.codeclimate.com/v1/badges/de7330528594f3257561/test_coverage" /></a> <a href="https://codeclimate.com/github/smallstack/utils/maintainability"><img src="https://api.codeclimate.com/v1/badges/de7330528594f3257561/maintainability" /></a>
+<a href="https://codeclimate.com/github/smallstack/utils/test_coverage"><img src="https://api.codeclimate.com/v1/badges/de7330528594f3257561/test_coverage" /></a> <a href="https://codeclimate.com/github/smallstack/utils/maintainability"><img src="https://api.codeclimate.com/v1/badges/de7330528594f3257561/maintainability" /></a> <a href="https://codecov.io/github/smallstack/utils" >
+<img src="https://codecov.io/github/smallstack/utils/branch/main/graph/badge.svg?token=6ORJYPTL4S"/>
+</a>
 
 # @smallstack/utils
 Opinionated selection of util functions used by smallstack projects.