title: Bot mention as a prefix in Discord.js
body: <p>My prefix only works if I do not add spaces to the entire command, example:</p>
  
  <pre><code>{
      "token": "",
      "prefix": "&lt;@453463055741747200&gt;"
  }
  
  
  const Discord = require("discord.js");
  
  module.exports.run = async (bot, message, args) =&gt; {
      let something = args.join(" ");
      message.delete().catch();
      message.channel.send(something);
  }
  
  module.exports.help = {
      name: "say"
  }
  </code></pre>
  
  <p>Let's say my bot name is <code>MyBot</code>, the above code would only work with <code>@MyBot</code> say this, how can I make it work when the command is <code>@MyBot</code> say this?</p>