title: remove trailing slash in Vue Router
body: <pre><code>const routes = [
    {
      path: '/:year',
      component: Nav,
      children: [
        { path: '', name: 'test', component: Test }
      ]
    }
  ];
  </code></pre>
  
  <pre><code>&lt;!-- /2018/ --&gt;
  &lt;router-link :to="{name: 'test', params: {year: 2018}}"&gt;&lt;/router-link&gt;
  </code></pre>
  
  <p>If there are children, I want to remove trailing slash added to the path created by router-link.</p>