Update README.md

Author: javadev

README.md

@@ -14,7 +14,7 @@ underscore-java
 [![Known Vulnerabilities](https://snyk.io/test/github/javadev/underscore-java/badge.svg?targetFile=pom.xml)](https://snyk.io/test/github/javadev/underscore-java?targetFile=pom.xml)
 [![Sputnik](https://sputnik.ci/conf/badge)](https://sputnik.ci/app#/builds/javadev/underscore-java)
 [![Code Scene](https://img.shields.io/badge/codescene-analyzed-brightgreen.svg)](https://codescene.io/projects/1173/jobs/latest-successful/results)
-[![](http://javadoc-badge.appspot.com/com.github.javadev/underscore.svg?label=JavaDocs)](http://www.javadoc.io/doc/com.github.javadev/underscore/)
+[![javadoc](https://javadoc.io/badge2/com.github.javadev/underscore/javadoc.svg)](https://javadoc.io/doc/com.github.javadev/underscore)
 [![Quality Gate](https://sonarcloud.io/api/project_badges/measure?project=javadev_underscore-java&metric=alert_status)](https://sonarcloud.io/dashboard/index/javadev_underscore-java)
 [![Quality Gate](https://sonarcloud.io/api/project_badges/measure?project=javadev_underscore-java&metric=sqale_rating)](https://sonarcloud.io/dashboard/index/javadev_underscore-java)
 [![Scrutinizer](https://img.shields.io/scrutinizer/g/javadev/underscore-java.svg)](https://scrutinizer-ci.com/g/javadev/underscore-java/)