Tiny fix to README

Author: cowtowncoder

README.md

@@ -18,7 +18,7 @@ JUG is licensed under [Apache License 2.0](http://www.apache.org/licenses/LICENS
 | Artifact |  [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.fasterxml.uuid/java-uuid-generator/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.fasterxml.uuid/java-uuid-generator/) |
 | OSS Sponsorship | [![Tidelift](https://tidelift.com/badges/package/maven/com.fasterxml.uuid:java-uuid-generator)](https://tidelift.com/subscription/pkg/maven-com-fasterxml-uuid-java-uuid-generator?utm_source=maven-com-fasterxml-uuid-java-uuid-generator&utm_medium=referral&utm_campaign=readme) |
 | Javadocs | [![Javadoc](https://javadoc.io/badge/com.fasterxml.uuid/java-uuid-generator.svg)](http://www.javadoc.io/doc/com.fasterxml.uuid/java-uuid-generator)
-| Code coverage (6.x) | [![codecov.io](https://codecov.io/github/cowtowncoder/java-uuid-generator/coverage.svg?branch=master)](https://codecov.io/github/cowtowncoder/java-uuid-generator?branch=master) |
+| Code coverage (4.x) | [![codecov.io](https://codecov.io/github/cowtowncoder/java-uuid-generator/coverage.svg?branch=master)](https://codecov.io/github/cowtowncoder/java-uuid-generator?branch=master) |
 | OpenSSF Score | [![OpenSSF  Scorecard](https://api.securityscorecards.dev/projects/github.com/cowtowncoder/java-uuid-generator/badge)](https://securityscorecards.dev/viewer/?uri=github.com/cowtowncoder/java-uuid-generator) |
 
 ## Usage