title: Vue select slot scope is undefined
body: <p>I've been debugging for 8 hours trying to find out why this vue-select code is not working, but still no luck. when I run it, it show an error "<strong>option is undefined</strong>".  I'm using npm to install vue-select plugin into my project. I put the following html code in my twig template.  I did follow the instructions on  <a href="https://sagalbot.github.io/vue-select/docs/Advanced/Templating.html" rel="nofollow noreferrer">vue-select page</a></p>
  
  <pre><code>&lt;div id="myapp"&gt;
          &lt;v-select :options="myoptions" label="title"&gt;
              &lt;template slot="option" slot-scope="option"&gt;
                  &lt;span class="fa" :class="option.icon"&gt;&lt;/span&gt;
                      {{ option.title }}
              &lt;/template&gt;
          &lt;/v-select&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Here's the rest of my js implementation code.</p>
  
  <pre><code>import Vue from 'vue';
  import VueSelect from 'vue-select';        
  Vue.component('v-select', VueSelect)
  
  new Vue({
      el: '#myapp',
      data: function () {
          return {
              myoptions: [
                  {
                      title: 'Read the Docs',
                      icon: 'fa-book',
                      url: 'https://codeclimate.com/github/sagalbot/vue-select'
                  },
                  {
                      title: 'View on GitHub',
                      icon: 'fa-github',
                      url: 'https://codeclimate.com/github/sagalbot/vue-select'
                  },
                  {
                      title: 'View on NPM',
                      icon: 'fa-database',
                      url: 'https://codeclimate.com/github/sagalbot/vue-select'
                  },
                  {
                      title: 'View Codepen Examples',
                      icon: 'fa-pencil',
                      url: 'https://codeclimate.com/github/sagalbot/vue-select'
                  }
              ]
          }
      }
  });
  </code></pre>