title: Accept for input type validation issue
body: <p>Hello I have added accept in file input type and when i upload png image it show error <code>Please enter a value with a valid extension.</code> searched a lot and tried different ways but couldn't figure out.</p>
  
  <p>Below is the code for file type.</p>
  
  <pre><code>&lt;input type="file" name="image" accept=".jpg, .png,.jpeg" id="file" class="custom-file-input" /&gt;
  </code></pre>
  
  <p>When i upload <code>png</code> image then only issue occurs with message <code>Please enter a value with a valid extension.</code></p>
  
  <p>In controller below is the code for validation of image.</p>
  
  <pre><code>$validator = Validator::make($request-&gt;all(), [
                  'image' =&gt; 'mimes:jpeg,bmp,png|max:4000',
              ]);
  </code></pre>