The name of the iteration variable in `valid-v-model` message is incorrectly

[ota-meshi]

Tell us about your environment

• ESLint version: 5.0.0
• eslint-plugin-vue version: 5.0.0-beta.3
• Node version: v8.11.3

Please show your full configuration:

{
  "rules" : {
    "vue/valid-v-model": "error"
  }
}

What did you do?

<template>
  <div>
    <div v-for="e in list">
      <input v-model="e">
    </div>
  </div>
</template>

What did you expect to happen?

Should be report that the variable e is assigned to v-model.

'v-model' directives cannot update the iteration variable 'e' itself.

What actually happened?

But the variable name is always x.

'v-model' directives cannot update the iteration variable 'x' itself.