def send_heartbeat
      millis = Time.now.strftime('%s%L').to_i
      @bot.debug("Sending voice heartbeat at #{millis}")

      @client.send({
        op: 3,
        d: nil
      }.to_json)
    end
def send_heartbeat
      millis = Time.now.strftime('%s%L').to_i
      @bot.debug("Sending voice heartbeat at #{millis}")

      @client.send({
        op: 3,
        d: nil
      }.to_json)
    end
Send a heartbeat (op 3), has to be done every @heartbeat_interval seconds or the connection will terminate