notification = () => {
    db.campaignanalytics.findOne({
      where: { campaignId: campaignInfo.campaignId },
      attributes: ['totalSentCount']
    }).then(campaignAnalytics => {
      const notification = {
        message: `Sent ${campaignAnalytics.totalSentCount} emails`,
        id, // Unique identified for use on client side (in the reducer)
        icon: 'fa-envelope',
        iconColour: 'text-green'
      };

      sendUpdateNotification(io, req, notification);
    });
  }
@description Send an update notification letting the user know how many emails have been sent
@param {object} campaignInfo - Information about this campaign
@param {object} io - Configured Redis instance
@param {object} req - The express request
@return {function} a function to call to send the update notification.