Fix grammar

README.md

@@ -1,6 +1,6 @@
 ![nginx 1.7.8](https://img.shields.io/badge/nginx-1.7.8-brightgreen.svg) ![License MIT](https://img.shields.io/badge/license-MIT-blue.svg)
 
-nginx-proxy sets up a container running nginx and [docker-gen][1].  docker-gen generate 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][1].  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.