how to do shields badges in readme code example

Example 1: readme shields

[![TravisCI (.org) build status](https://img.shields.io/travis/jupyterhub/jupyterhub/master?logo=travis)](https://travis-ci.org/jupyterhub/jupyterhub)

Example 2: readme shields

[![TravisCI (.com) build status](https://img.shields.io/travis/com/jupyterhub/jupyterhub/master?logo=travis)](https://travis-ci.com/jupyterhub/jupyterhub)