Update README.md

Author: jsvd

README.md

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 Travis Build
 [![Travis Build Status](https://travis-ci.org/logstash-plugins/logstash-input-redis.svg)](https://travis-ci.org/logstash-plugins/logstash-input-redis)
 
-Jenkins Build
-[![Travis Build Status](https://travis-ci.org/logstash-plugins/logstash-input-redis.svg)](https://travis-ci.org/logstash-plugins/logstash-input-redis)
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 This is a plugin for [Logstash](https://github.com/elastic/logstash).
 
 It is fully free and fully open source. The license is Apache 2.0, meaning you are pretty much free to use it however you want in whatever way.