Suggestion: Allow option to filter on routes

[sebmor]

There is already an option to ignore routes, but in the many cases where you only have one or a few pages that need the persist their scroll, it's often easier to only select these instead of ignoring all the rest.

I suggest a filter kind of option:

Vue.use(vueScrollBehavior, {
  filter: [/\/boo/, /\/zoo/],    // only apply on these routes,
})

[Yazhe Wang]

Right, we just need a filter option to match our routes.
I marked it as a new feature for PR.

[Deleted user]

must have