Readme: Update chat room info

README.md

@@ -56,14 +56,13 @@ After that you can build the add-on by executing in the project's root directory
 
 
 ## Developer Version
+
 You can also install the pre-built [developer version here](https://croydon.github.io/vtr-releases/). By using it you can help me testing new versions before they are getting shipped to everyone.
 
 
 ## Contact
 
-If you want to have a chat with me you can join #vtr:matrix.org with every Matrix client, e.g. Riot:
-https://riot.im/app/#/room/#vtr:matrix.org
-or connect with an IRC client to #verticaltabsreloaded on chat.freenode.net
+If you want to have a chat with me you can join #vtr:matrix.org with every Matrix client, e.g. Element: https://app.element.io/#/room/#vtr:matrix.org
 
 
 ## License and Credits