Update raven-js to 3.1.1 (#3583)
Update raven-js to 3.1.1 (#3583)

/cc @getsentry/team
ifduyue/sentry,ifduyue/sentry,JamesMura/sentry,zenefits/sentry,looker/sentry,ifduyue/sentry,JamesMura/sentry,alexm92/sentry,jean/sentry,mvaled/sentry,looker/sentry,jean/sentry,BuildingLink/sentry,mvaled/sentry,looker/sentry,JamesMura/sentry,looker/sentry,gencer/sentry,jean/sentry,beeftornado/sentry,jean/sentry,mvaled/sentry,alexm92/sentry,fotinakis/sentry,mvaled/sentry,BuildingLink/sentry,mvaled/sentry,mvaled/sentry,ifduyue/sentry,JamesMura/sentry,beeftornado/sentry,JamesMura/sentry,fotinakis/sentry,jean/sentry,BuildingLink/sentry,gencer/sentry,gencer/sentry,alexm92/sentry,zenefits/sentry,mitsuhiko/sentry,JackDanger/sentry,zenefits/sentry,ifduyue/sentry,BuildingLink/sentry,BuildingLink/sentry,looker/sentry,JackDanger/sentry,zenefits/sentry,gencer/sentry,beeftornado/sentry,zenefits/sentry,mitsuhiko/sentry,fotinakis/sentry,gencer/sentry,JackDanger/sentry,fotinakis/sentry