Fix promises example re: unhandledrejection in docs
Fix promises example re: unhandledrejection in docs

Mappy/raven-js,housinghq/main-raven-js,getsentry/raven-js,getsentry/raven-js,getsentry/raven-js,Mappy/raven-js,getsentry/raven-js,Mappy/raven-js,housinghq/main-raven-js,housinghq/main-raven-js