API: - req.session.setFlash was removed, if you were using this please comment on
GitHub
API: - you need to import withIronSession as a named export:
before: import withIronSession from "next-iron-session"
after: import { withIronSession } from "next-iron-session"
cookieName: cookieName is now mandatory, to avoid issues of shared
cookieNames in examples etc..