v6.0.0

Migration guide: https://spry.fun/migration

What's Changed

• refactor: remove group router (The app.group/app.grouped).
• refactor: rename app.stack to app.middleware.
• refactor: remove useRequest(), now use event.request.
• refactor: remove useHeaders(), now use event.headers/event.request.headers.
• refactor: remove getClientAddress(), now use event.address.
• refactor: remove useRequestURI(), now use event.url.
• refactor: remove useParams(), now use event.params.
• refactor: rename factory Response.text() to Response.fromString().
• refactor: rename factory Response.json() to Response.fromJson().
• refactor: remove all adapter, now is cross-platform.