title: Vue for loop inside template
body: <p>I have a Vue template wich recieves a json string as data:</p>
  
  <pre><code>&lt;component data="{{ object.toJson() }}"&gt;&lt;/component&gt;
  </code></pre>
  
  <p>object consists out of a name and an array of strings. I now have this in my </p>
  
  <pre><code>&lt;template&gt;    
      &lt;ul&gt;
        &lt;li v-for="url in object.data['urls']"&gt;{{ url }}&lt;/li&gt;
      &lt;/ul&gt;
  &lt;/template&gt;
  </code></pre>
  
  <p>This however is giving errors on my linter and I was wondering why. This is exactly as according to the Vue examples posted on the documentation.</p>
  
  <blockquote>
    <p>error  Elements in iteration expect to have 'v-bind:key' directives  vue/require-v-for-key</p>
  </blockquote>