Update raven-js to latest sha (3.0.0-beta2)
Update raven-js to latest sha (3.0.0-beta2)

/cc @getsentry/team

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