Merge pull request #546 from tkrs/tkrs-patch-1

docs: fix codecov badge

README.md

@@ -5,7 +5,7 @@ Yet another fluentd logger for scala
 [![CI](https://github.com/tkrs/fluflu/workflows/CI/badge.svg)](https://github.com/tkrs/fluflu/actions?query=workflow%3ACI)
 [![Release](https://github.com/tkrs/fluflu/workflows/Release/badge.svg)](https://github.com/tkrs/fluflu/actions?query=workflow%3ARelease)
 [![Tagging](https://github.com/tkrs/fluflu/actions/workflows/tagging.yml/badge.svg)](https://github.com/tkrs/fluflu/actions/workflows/tagging.yml)
-[![codecov.io](http://codecov.io/github/tkrs/fluflu/coverage.svg?branch=master)](http://codecov.io/github/tkrs/fluflu?branch=master)
+[![codecov](https://codecov.io/github/tkrs/fluflu/graph/badge.svg?token=p0aMOSH7M3)](https://codecov.io/github/tkrs/fluflu)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.github.tkrs/fluflu-core_2.12/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.github.tkrs/fluflu-core_2.12)
 
 ## How to use it