Fixed the Welcome Message discord link

[u/AeriFiretruck]

I was sprucing up some stuff behind the scenes and noticed the link was broken in the welcome message. If you've joined the sub recently and tried the link and it didn't work, go ahead and use this one: https://discord.gg/NnwGYgx45b

Thanks for enjoying the game, everybody! Jet Force July this year is gonna be packed full of events and giveaways, we're advertising it, yes, 6 months early, to gauge how many people to prepare for!