title: Discord.js - Allow command in specific channel
body: <p>I am owning a Discord.js bot and I can't figure out how to do that :/</p>
  
  <p>I want the users to type the command !help in the #commands channel only.</p>
  
  <p>P.S. I know how to get the channel ID and I have it.</p>
  
  <p>So what should I do in the command event to do that?</p>
  
  <p>Thanks!</p>