Update README.md

Add build status
openzipkin-contrib · Mar 2, 2019 · c2a0ff2 · c2a0ff2
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diff --git a/README.md b/README.md
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 # Kafka Interceptor: Zipkin
 
+[![Build Status](https://www.travis-ci.org/sysco-middleware/kafka-interceptor-zipkin.svg?branch=master)](https://www.travis-ci.org/sysco-middleware/kafka-interceptor-zipkin)
+
 Kafka [Consumer](https://kafka.apache.org/0100/javadoc/org/apache/kafka/clients/consumer/ConsumerInterceptor.html)
 and 
 [Producer](https://kafka.apache.org/0100/javadoc/org/apache/kafka/clients/producer/ProducerInterceptor.html) 
@@ -81,4 +83,4 @@ ksql http://localhost:8088
 
 5. Check traces:
 
-![](docs/traces.png)
+![](docs/traces.png)