message: Update joining steps in the readme
diff: @@ -35,8 +35,9 @@ Please also be aware that this is an unoffical project worked on in my (Half-Sho
  * Make sure to create a bot user. Fill in ``config.yaml``
  * Run ``npm run-script getbotlink`` to get a authorisation link.
  * Give this link to owners of the guilds you plan to bridge.
  -* Finally, you can join a room with ``#_discord_GuildName#channelname``
  - * Where the guild name has the spaces replaced with ``-``.
  +* Finally, you can join a room with ``#_discord_guildid_channelid``
  + * These can be taken from the url ("/$GUILDID/$CHANNELID") when you are in a channel.
  + * Riot (and other clients with third party protocol support) users can directly join channels from the room directory.
  ## Features and Roadmap
  In a vague order of what is coming up next
  