title: Get a random user from server discord.js
body: <p>How do you pick a random user from a server that a bot is in?</p>
  
  <p>For example, GiveawayBot randomly picks a user in a giveaway. How can I implement that but without having to click on a reaction for the giveaway?</p>
  
  <p>Also an example, @r in a command in Minecraft.</p>