housekeeping: update build badge (via #1448)

Author: JonathanParrilla

README.md

@@ -1,6 +1,7 @@
 # Swagger Client <img src="https://raw.githubusercontent.com/swagger-api/swagger.io/wordpress/images/assets/SW-logo-clr.png" height="50" align="right">
 
 [![Build Status](https://travis-ci.org/swagger-api/swagger-js.svg?branch=master)](https://travis-ci.org/swagger-api/swagger-js)
+[![Build Status](https://jenkins.swagger.io/view/OSS%20-%20JavaScript/job/oss-swagger-js-master/badge/icon?subject=jenkins%20build)](https://jenkins.swagger.io/view/OSS%20-%20JavaScript/job/oss-swagger-js-master/)
 
 **Swagger Client** is a JavaScript module that allows you to fetch, resolve, and interact with Swagger/OpenAPI documents.