Update Travis CI badge

Author: buchdag

README.md

@@ -1,4 +1,4 @@
-[![Build Status](https://travis-ci.org/JrCs/docker-letsencrypt-nginx-proxy-companion.svg?branch=master)](https://travis-ci.org/JrCs/docker-letsencrypt-nginx-proxy-companion)
+[![Build Status](https://travis-ci.org/nginx-proxy/docker-letsencrypt-nginx-proxy-companion.svg?branch=master)](https://travis-ci.org/nginx-proxy/docker-letsencrypt-nginx-proxy-companion)
 [![GitHub release](https://img.shields.io/github/release/jrcs/docker-letsencrypt-nginx-proxy-companion.svg)](https://github.com/JrCs/docker-letsencrypt-nginx-proxy-companion/releases)
 [![Image info](https://images.microbadger.com/badges/image/jrcs/letsencrypt-nginx-proxy-companion.svg)](https://hub.docker.com/r/jrcs/letsencrypt-nginx-proxy-companion "Click to view the image on Docker Hub")
 [![Docker stars](https://img.shields.io/docker/stars/jrcs/letsencrypt-nginx-proxy-companion.svg)](https://hub.docker.com/r/jrcs/letsencrypt-nginx-proxy-companion "Click to view the image on Docker Hub")