Add support for v-on="$listeners" (#89)

[armano2]

this pull request fixes #89 and vuejs/vetur#339

[nickmessing]

Theoretically we could use something like:

<template>
  <button v-on="listeners">Hey</button>
</template>
<script>
export default {
  data: () => ({ // doesn't have to be in data, just an example
    listeners: {
      click: someFn,
      keyup: someOtherFn
    }
  })
}
</script>

And it is valid in Vue starting with 2.4.0. This is a bad pattern most of the time but sometimes it could be useful like having a computed property that removes click from $listeners but has anything else.

Do we consider that?

[armano2]

@nickmessing Not in this PR, but for now Vue itself doesn't support this syntax (or maybe i understand this incorrectly)

https://vuejs.org/v2/api/#vm-listeners

In case when we can pass wathever object we like to, this rule is not valid anymore and should be removed.
'v-on' directives require event names.

[nickmessing]

@armano2, vue does support that so I am not sure this rule is valid anymore, here's an example: https://jsfiddle.net/z8y5fpx6/

[armano2]

thank you for clarification, part of this rule has been removed

[mysticatea]

LGTM, thank you so much!