Update README.md

Author: vanderbr

README.md

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 # @agecheck/core
 
 [![CI](https://github.com/agecheck/agecheck-core/actions/workflows/ci.yml/badge.svg?branch=main)](https://github.com/agecheck/agecheck-core/actions/workflows/ci.yml)
-[![Publish](https://github.com/agecheck/agecheck-core/actions/workflows/publish.yml/badge.svg?branch=main)](https://github.com/agecheck/agecheck-core/actions/workflows/publish.yml)
+[![Publish](https://github.com/agecheck/agecheck-core/actions/workflows/publish.yml/badge.svg)](https://github.com/agecheck/agecheck-core/actions/workflows/publish.yml)
 [![npm](https://img.shields.io/npm/v/%40agecheck%2Fcore?label=npm)](https://www.npmjs.com/package/@agecheck/core)
 
 `@agecheck/core` is the common TypeScript core used by AgeCheck SDK adapters.