Change tags for ubuntu

Author: zeroc0d3

README.md

@@ -1,4 +1,4 @@
 # Core-Base Container
 Core-Base Container of Docker Framework
 
-[![Build Status](https://travis-ci.org/dockerframework/core-base.svg?branch=master)](https://travis-ci.org/dockerframework/core-base) [![](https://images.microbadger.com/badges/image/dockerframework/core-base:16.04-ubuntu.svg)](https://microbadger.com/images/dockerframework/core-base:16.04-ubuntu "Layers") [![](https://images.microbadger.com/badges/version/dockerframework/core-base:16.04-ubuntu.svg)](https://microbadger.com/images/dockerframework/core-base:16.04-ubuntu "Version") [![GitHub issues](https://img.shields.io/github/issues/dockerframework/core-base.svg)](https://github.com/dockerframework/core-base/issues) [![GitHub forks](https://img.shields.io/github/forks/dockerframework/core-base.svg)](https://github.com/dockerframework/core-base/network) [![GitHub stars](https://img.shields.io/github/stars/dockerframework/core-base.svg)](https://github.com/dockerframework/core-base/stargazers) [![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/dockerframework/core-base/master/LICENSE)
+[![Build Status](https://travis-ci.org/dockerframework/core-base.svg?branch=master)](https://travis-ci.org/dockerframework/core-base) [![](https://images.microbadger.com/badges/image/dockerframework/core-base:ubuntu.svg)](https://microbadger.com/images/dockerframework/core-base:ubuntu "Layers") [![](https://images.microbadger.com/badges/version/dockerframework/core-base:ubuntu.svg)](https://microbadger.com/images/dockerframework/core-base:ubuntu "Version") [![GitHub issues](https://img.shields.io/github/issues/dockerframework/core-base.svg)](https://github.com/dockerframework/core-base/issues) [![GitHub forks](https://img.shields.io/github/forks/dockerframework/core-base.svg)](https://github.com/dockerframework/core-base/network) [![GitHub stars](https://img.shields.io/github/stars/dockerframework/core-base.svg)](https://github.com/dockerframework/core-base/stargazers) [![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/dockerframework/core-base/master/LICENSE)