message: Fix Gitter link.
diff: -[![Join the chat at https://gitter.im/railsware/upterm](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/railsware/upterm?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
  +[![Join the chat at https://gitter.im/railsware/upterm](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/upterm/Lobby)
  [![Build Status](https://travis-ci.org/railsware/upterm.svg?branch=master)](https://travis-ci.org/railsware/upterm)
  What Is It?
  