title: v-validate files.every is not a function
body: <p>i use bootstrap-vue and v-validate in vuejs, When I want to use validation in a input file, I get the following error:</p>
  
  <pre><code>[Vue warn]: Error in event handler for "input": "TypeError: files.every is not a function"
  </code></pre>
  
  <hr>
  
  <p>code:</p>
  
  <pre><code>&lt;b-form-file
              id="attachment"
              name="attachment"
              accept="application/zip,image/x-png,image/jpeg"
              v-validate="'ext:zip,png,jpeg,jpg|size:10240'"&gt;
   &lt;/b-form-file&gt;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/m7Wfs.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/m7Wfs.png" alt="error code"></a></p>