app.use(session(app)) koa deprecated Support for generators will be removed in v3
When I use the 'koa-session' there is a warning:
> koa deprecated Support for generators will be removed in v3. See the documentation for examples of how to convert old middleware https://github.com/koajs/koa/blob/master/docs/migration.md

But on [koa-generic-session](https://github.com/koajs/generic-session), I see "please migrate to koa-session".
Sorry, I'm confused.... Where is the right way?

