Add eslint exception for underscore.js
Add eslint exception for underscore.js

andrhamm/Singularity,HubSpot/Singularity,andrhamm/Singularity,hs-jenkins-bot/Singularity,hs-jenkins-bot/Singularity,andrhamm/Singularity,HubSpot/Singularity,HubSpot/Singularity,andrhamm/Singularity,hs-jenkins-bot/Singularity,hs-jenkins-bot/Singularity,hs-jenkins-bot/Singularity,HubSpot/Singularity,HubSpot/Singularity,andrhamm/Singularity