Update README.md

Author: magicprinc

README.md

@@ -1,6 +1,6 @@
 # FastUtil Concurrent Wrapper
 
-![Java CI](https://github.com/magicprinc/fastutil-concurrent-wrapper/actions/workflows/gradle.yml/badge.svg)
+[![Java CI](https://github.com/magicprinc/fastutil-concurrent-wrapper/actions/workflows/gradle.yml/badge.svg)](https://github.com/magicprinc/fastutil-concurrent-wrapper/actions/workflows/gradle.yml)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.trivago/fastutil-concurrent-wrapper/badge.svg?style=plastic)](https://maven-badges.herokuapp.com/maven-central/com.trivago/fastutil-concurrent-wrapper/)
 
 ## Description