docs: fix markdown link error

README.md

@@ -6,9 +6,9 @@
 [![Docker pulls](https://img.shields.io/docker/pulls/nginxproxy/nginx-proxy.svg)](https://hub.docker.com/r/nginxproxy/nginx-proxy 'DockerHub')
 
 
-nginx-proxy sets up a container running nginx and [docker-gen][1].  docker-gen generates reverse proxy configs for nginx and reloads nginx when containers are started and stopped.
+nginx-proxy sets up a container running nginx and [docker-gen](https://github.com/nginx-proxy/docker-gen). docker-gen generates reverse proxy configs for nginx and reloads nginx when containers are started and stopped.
 
-See [Automated Nginx Reverse Proxy for Docker][2] for why you might want to use this.
+See [Automated Nginx Reverse Proxy for Docker](http://jasonwilder.com/blog/2014/03/25/automated-nginx-reverse-proxy-for-docker/) for why you might want to use this.
 
 ### Usage