update irc information for users that are still on ancient versions
-IRC means Internet Relay Chat and is basically a server where you can find tons of chatrooms with different topics.
-SecurityCraft connects to such a chatroom as soon as you do '/sc connect' and sends all messages from '/sc contact' into that room.
-Anyone who is in that room is able to contact you by prefixing your name to their message.
+Hello, IRC support is no longer available.
-Please note that the following things are not possible:
-- Connecting to your world to play with you
-- Controlling your Minecraft client in any ways
-- Seeing what you are currently doing
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+Please use our Discord from now on (English):
+https://discord.gg/U8DvBAW
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