message: Fix koa doc variable name mixup, fixes
diff: @@ -10,7 +10,7 @@ Koa
  Raven.config('___DSN___').install();
  app.on('error', function (err) {
  - sentry.captureException(err, function (err, eventId) {
  + Raven.captureException(err, function (err, eventId) {
  console.log('Reported error ' + eventId);
  });
  });
  