v-for missing v-bind:key

[ragaar]

It is recommended to provide a key with v-for whenever possible, unless the iterated DOM content is simple, or you are intentionally relying on the default behavior for performance gains.

I'm not very experienced with Vue, but I'll try to add this to encourage good practice in others.

REFERENCE:

1. https://vuejs.org/v2/guide/list.html#v-for-with-an-Object

[p-adams]

Thanks. I will look out for your PR. I do plan on updating the tutorial soon.