Added JavaDoc.io Badge

Author: RobWin

README.adoc

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-image:https://travis-ci.org/resilience4j/resilience4j.svg?branch=master["Build Status", link="https://travis-ci.org/resilience4j/resilience4j"] image:https://coveralls.io/repos/github/resilience4j/resilience4j/badge.svg?branch=master&k=1["Coverage Status", link="https://coveralls.io/github/resilience4j/resilience4j?branch=master"] image:https://api.codacy.com/project/badge/Grade/f0295918d02b45d0928d5adc95f6eba1["Codacy code quality", link="https://www.codacy.com/app/robwin/resilience4j?utm_source=github.com&utm_medium=referral&utm_content=resilience4j/resilience4j&utm_campaign=Badge_Grade"] image:https://api.bintray.com/packages/resilience4j/Maven/resilience4j/images/download.svg[link="https://bintray.com/resilience4j/Maven/resilience4j/_latestVersion"] image:http://img.shields.io/badge/license-ASF2-blue.svg["Apache License 2", link="http://www.apache.org/licenses/LICENSE-2.0.txt"]
+image:https://travis-ci.org/resilience4j/resilience4j.svg?branch=master["Build Status", link="https://travis-ci.org/resilience4j/resilience4j"] image:https://coveralls.io/repos/github/resilience4j/resilience4j/badge.svg?branch=master&k=1["Coverage Status", link="https://coveralls.io/github/resilience4j/resilience4j?branch=master"] image:https://api.codacy.com/project/badge/Grade/f0295918d02b45d0928d5adc95f6eba1["Codacy code quality", link="https://www.codacy.com/app/robwin/resilience4j?utm_source=github.com&utm_medium=referral&utm_content=resilience4j/resilience4j&utm_campaign=Badge_Grade"] image:https://api.bintray.com/packages/resilience4j/Maven/resilience4j/images/download.svg[link="https://bintray.com/resilience4j/Maven/resilience4j/_latestVersion"] image:http://javadoc.io/badge/io.github.resilience4j/resilience4j.svg[JavaDoc, link="http://javadoc.io/doc/io.github.resilience4j/resilience4j"] image:http://img.shields.io/badge/license-ASF2-blue.svg["Apache License 2", link="http://www.apache.org/licenses/LICENSE-2.0.txt"]
 
 == Introduction