Update README.md

Author: javadev

README.md

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 # LeetCode-in-Java
 
-[![Maven Central](https://img.shields.io/maven-central/v/com.github.javadev/leetcode-in-java.svg)](http://search.maven.org/#search%7Cga%7C1%7Cg%3A%22com.github.javadev%22%20AND%20a%3A%22leetcode-in-java%22)
+[![Maven Central](https://img.shields.io/maven-central/v/com.github.javadev/leetcode-in-java?style=flat-square)](https://central.sonatype.com/artifact/com.github.javadev/leetcode-in-java/1.18)
 [![MIT License](http://img.shields.io/badge/license-MIT-green.svg) ](https://github.com/javadev/leetcode-in-java/blob/main/LICENSE)
 [![Java CI](https://github.com/javadev/LeetCode-in-Java/actions/workflows/maven.yml/badge.svg)](https://github.com/javadev/LeetCode-in-Java/actions/workflows/maven.yml)
 [![Maintainability Rating](https://sonarcloud.io/api/project_badges/measure?project=javadev_LeetCode-in-Java&metric=sqale_rating)](https://sonarcloud.io/summary/overall?id=javadev_LeetCode-in-Java)