Updated README.md

Author: pilwon

README.md

@@ -4,7 +4,7 @@
 This repository contains **Dockerfile** of [Nginx](http://nginx.org/) for [Docker](https://www.docker.com/)'s [automated build](https://registry.hub.docker.com/u/dockerfile/nginx/) published to the public [Docker Hub Registry](https://registry.hub.docker.com/).
 
 
-### Dependencies
+### Base Docker Image
 
 * [dockerfile/ubuntu](http://dockerfile.github.io/#/ubuntu)