Add router.js auto-update

What's Changed

• Add prepare script and engines by @Kolobok12309 in #13
• Add auto-update of generated router.js in nuxt module by @Kolobok12309 in #12

Full Changelog: v1.1.3...v1.1.4

v1.1.3

Bump nanoid from 3.1.25 to 3.3.1
Bump url-parse from 1.5.3 to 1.5.10

v1.1.2

Fix webpack 5 compatibility