title: Discord.js how to assign person sending the command to a variable
body: <p>My question may sound odd I apologize. But im working on a command for my bot that changes your own nickname when you type '>callme newNickName'.</p>
  
  <pre><code>case 'callme':
          let nick = args[1];
          setNickname(nick); //this is where i am stuck
          break;
  </code></pre>
  
  <p>I'm not sure how to define the person who sent the command so that their own nickname gets changed accordingly.</p>