Add image to repo. Make more clear that mattermost is not required to run matterbridge

README.md

@@ -5,12 +5,15 @@ Click on one of the badges below to join the chat
 
 [![Download stable](https://img.shields.io/github/release/42wim/matterbridge.svg?label=download%20stable)](https://github.com/42wim/matterbridge/releases/latest) [![Download dev](https://img.shields.io/bintray/v/42wim/nightly/Matterbridge.svg?label=download%20dev&colorB=007ec6)](https://bintray.com/42wim/nightly/Matterbridge/_latestVersion)
 
-![matterbridge.gif](https://s15.postimg.org/qpjhp6y3f/matterbridge.gif)
+![matterbridge.gif](https://github.com/42wim/matterbridge/blob/master/img/matterbridge.gif)
 
-Simple bridge between Mattermost, IRC, XMPP, Gitter, Slack, Discord, Telegram, Rocket.Chat, Hipchat(via xmpp), Matrix, Steam and ssh-chat
+Simple bridge between IRC, XMPP, Gitter, Mattermost, Slack, Discord, Telegram, Rocket.Chat, Hipchat(via xmpp), Matrix, Steam and ssh-chat
 Has a REST API.  
 Minecraft server chat support via [MatterLink](https://github.com/elytra/MatterLink)
 
+**Mattermost isn't required to run matterbridge. It bridges between any supported protocol.**   
+The name matterbridge is a remnant when it was only bridging mattermost)
+
 # Table of Contents
  * [Features](https://github.com/42wim/matterbridge/wiki/Features)
  * [Requirements](#requirements)