Fixed Jenkins badge.
Apache Log4j 2 is an upgrade to Log4j that provides significant improvements over its predecessor, Log4j 1.x,
and provides many of the improvements available in Logback while fixing some inherent problems in Logback's architecture.
-[![Jenkins Status](https://img.shields.io/jenkins/s/https/builds.apache.org/job/Log4j%202.x.svg)](https://builds.apache.org/job/Log4j%202.x/)
+[![Jenkins Status](https://img.shields.io/jenkins/s/https/ci-builds.apache.org/job/Logging/job/log4j/job/release-2.x.svg)](https://ci-builds.apache.org/job/Logging/job/log4j/job/release-2.x/)
[![Travis Status](https://travis-ci.org/apache/logging-log4j2.svg?branch=master)](https://travis-ci.org/apache/logging-log4j2)
[![Maven Central](https://img.shields.io/maven-central/v/org.apache.logging.log4j/log4j-api.svg)](http://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-api)
