Add Jenkins badge

(this is mainly to test Jenkins integration, as per #16)

README.md

@@ -2,6 +2,7 @@
 [![DOI](https://zenodo.org/badge/4622/tferr/Scripts.svg)](https://zenodo.org/badge/latestdoi/4622/tferr/Scripts)
 [![Latest Release](https://img.shields.io/github/release/tferr/Scripts.svg?style=flat-square)](https://github.com/tferr/Scripts/releases)
 [![Issues](https://img.shields.io/github/issues/tferr/Scripts.svg?style=flat-square)](https://github.com/tferr/Scripts/issues)
+[![Jenkins](http://img.shields.io/jenkins/s/http/jenkins.imagej.net/BAR.svg?style=flat-square)](http://jenkins.imagej.net/job/BAR)
 [![GPL License](http://img.shields.io/badge/license-GPL-blue.svg?style=flat-square)](http://opensource.org/licenses/GPL-3.0)
 
 Welcome to the **IJ BAR**: A collection of <b>B</b>roadly <b>A</b>pplicable <b>R</b>outines for