Add Travis CI badge

Author: acogoluegnes

README.md

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 ## RabbitMQ Performance Testing Tool
 
+[![Travis CI](https://travis-ci.org/rabbitmq/rabbitmq-jms-client.svg?branch=master)](https://travis-ci.org/rabbitmq/rabbitmq-perf-test)
+
 This repository contains source code of the [RabbitMQ Performance Testing Tool](https://www.rabbitmq.com/java-tools.html).
 The client is maintained by the [RabbitMQ team at Pivotal](http://github.com/rabbitmq/).