Vue-Loader Warning about style

[starvsion]

Every time Vue-loader compiles, it will warn about this,. I think we should setup eslint on this project, to make sure that we are up to the official Vue Style Guide

(Emitted value instead of an instance of Error) <el-radio v-for="item in items">: component lists rendered with v-for should have explicit keys. See https://vuejs.org/guide/list.html#key for more info.

[egorzot]

#4