title: Clang-format: space before unary operator
body: <p>I would like to configure clang-format to put a space before unary operators (to increase readability):</p>
  
  <ul>
  <li><p>Instead of:</p>
  
  <p>i++;</p></li>
  <li><p>I would like:</p>
  
  <p>i ++;</p></li>
  </ul>
  
  <p>Is it possible? (I can't find anything about this in the documentation.)<br/>
  If not, could one submit a feature request for clang-format?</p>