client.on('message', function(message) {
    if(message.content.startsWith(prefix + 'roll')) {
        let args = message.content.split(" ").slice(1);
        if (!args[0]) {
            message.channel.send('**Please supply a number**');
            return;
            }
    message.channel.send(Math.floor(Math.random() * args.join(' ')));
            if (!args[0]) {
          message.edit('1')
          return;
        }
    }
});