Update nginx 1.9.15

Dockerfile

@@ -1,4 +1,4 @@
-FROM nginx:1.9.12
+FROM nginx:1.9.15
 MAINTAINER Jason Wilder mail@jasonwilder.com
 
 # Install wget and install/updates certificates

README.md

@@ -1,4 +1,4 @@
-![nginx 1.9.12](https://img.shields.io/badge/nginx-1.9.12-brightgreen.svg) ![License MIT](https://img.shields.io/badge/license-MIT-blue.svg) [![Build](https://circleci.com/gh/jwilder/nginx-proxy.svg?&style=shield&circle-token=2da3ee844076a47371bd45da81cf27409ca7306a)](https://circleci.com/gh/jwilder/nginx-proxy) [![Build Status](https://travis-ci.org/jwilder/nginx-proxy.svg?branch=master)](https://travis-ci.org/jwilder/nginx-proxy) [![](https://img.shields.io/docker/stars/jwilder/nginx-proxy.svg)](https://hub.docker.com/r/jwilder/nginx-proxy 'DockerHub') [![](https://img.shields.io/docker/pulls/jwilder/nginx-proxy.svg)](https://hub.docker.com/r/jwilder/nginx-proxy 'DockerHub')
+![nginx 1.9.15](https://img.shields.io/badge/nginx-1.9.15-brightgreen.svg) ![License MIT](https://img.shields.io/badge/license-MIT-blue.svg) [![Build](https://circleci.com/gh/jwilder/nginx-proxy.svg?&style=shield&circle-token=2da3ee844076a47371bd45da81cf27409ca7306a)](https://circleci.com/gh/jwilder/nginx-proxy) [![Build Status](https://travis-ci.org/jwilder/nginx-proxy.svg?branch=master)](https://travis-ci.org/jwilder/nginx-proxy) [![](https://img.shields.io/docker/stars/jwilder/nginx-proxy.svg)](https://hub.docker.com/r/jwilder/nginx-proxy 'DockerHub') [![](https://img.shields.io/docker/pulls/jwilder/nginx-proxy.svg)](https://hub.docker.com/r/jwilder/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.