Update readme with travis build status

Author: eithe

README.md

@@ -1,3 +1,5 @@
+[![Build Status](https://travis-ci.com/eithe/node-red-contrib-jsonstat.svg?branch=master)](https://travis-ci.com/eithe/node-red-contrib-jsonstat)
+
 # jsonstat nodes for Node-RED
 
 > These nodes let you (somewhat) easily deal with jsonstat formatted data
@@ -14,7 +16,6 @@ https://www.npmjs.com/package/node-red-contrib-jsonstat
 - Documentation
 - Help inside Node-RED
 - Increase test coverage
-- Setup Travis
 - Node icons
 - jsonstat collections
 - jsonstat dimensions