title: Error when using v-model on file input
body: <p>I have a file input and I need to clear it after file is uploaded. I tried setting null value to v-model, but it generated the following error</p>
  
  <blockquote>
    <p>File inputs are read only. Use a v-on:change listener instead.</p>
  </blockquote>
  
  <p>My code is </p>
  
  <pre><code>&lt;input id="fileupload" type="file" v-model="file" multiple v-on:change="uploadFile" ref="fileInput" /&gt;
  </code></pre>
  
  <p>How can I clear the file input in vue.js after upload so that I can upload the same file multiple times continuously</p>