adding travis badge

Author: ph

README.md

@@ -3,7 +3,7 @@ Travis Build
 [![Travis Build Status](https://travis-ci.org/logstash-plugins/logstash-input-file.svg)](https://travis-ci.org/logstash-plugins/logstash-input-file)
 
 Jenkins Build
-[![Build Status](http://build-eu-00.elastic.co/view/LS%20Plugins/view/LS%20Inputs/job/logstash-plugin-input-file-unit/badge/icon)](http://build-eu-00.elastic.co/view/LS%20Plugins/view/LS%20Inputs/job/logstash-plugin-input-file-unit/)
+[![Travis Build Status](https://travis-ci.org/logstash-plugins/logstash-input-file.svg)](https://travis-ci.org/logstash-plugins/logstash-input-file)
 
 This is a plugin for [Logstash](https://github.com/elastic/logstash).