Correct Koa installation docs
Correct Koa installation docs

getsentry/raven-js,Livefyre/raven-node,getsentry/raven-js,BuildingConnected/raven-node,getsentry/raven-js,miguelb/raven-node,miguelb/raven-node,getsentry/raven-js,getsentry/raven-node,getsentry/raven-node