Keep scroll position on update in Next.js

[JuroUhlar]

Hi, updating the state in NextJS scrolls makes the page scroll to the top. That's usually not what you want, and I think it can be easily prevented by using router[method](newUrl, undefined, { scroll: false }) (or making the behavior configurable).

More details regarding the Next.js behavior here: vercel/next.js#20606

Thanks a lot for making this package!