Update README.md

Author: tdebatty

README.md

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 #java-string-similarity
-[![Maven Central](https://maven-badges.herokuapp.com/maven-central/info.debatty/java-string-similarity/badge.svg)](https://maven-badges.herokuapp.com/maven-central/info.debatty/java-string-similarity)
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+[![Maven Central](https://maven-badges.herokuapp.com/maven-central/info.debatty/java-string-similarity/badge.svg)](https://maven-badges.herokuapp.com/maven-central/info.debatty/java-string-similarity) [![Build Status](https://travis-ci.org/tdebatty/java-string-similarity.svg?branch=master)](https://travis-ci.org/tdebatty/java-string-similarity)
 
 A library implementing different string similarity and distance algorithms.