Update badge

README.md

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 ![CI](https://github.com/qvantel/jsonapi-scala/actions/workflows/ci.yml/badge.svg)
 [![codecov](https://codecov.io/gh/qvantel/jsonapi-scala/branch/master/graph/badge.svg)](https://codecov.io/gh/qvantel/jsonapi-scala)
-[![Maven Central (2.12 and 2.13)](https://maven-badges.herokuapp.com/maven-central/com.qvantel/jsonapi-scala-core_2.13/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.qvantel/jsonapi-scala-core_2.13)
+[![Maven Central (2.12)](https://maven-badges.herokuapp.com/maven-central/com.qvantel/jsonapi-scala-core_2.12/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.qvantel/jsonapi-scala-core_2.12)
+[![Maven Central (2.13)](https://maven-badges.herokuapp.com/maven-central/com.qvantel/jsonapi-scala-core_2.13/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.qvantel/jsonapi-scala-core_2.1)
 
 ## Features
 * Automatic generation of jsonapi json writers with relationship handling for case classes