title: ESLint autofix ignore rule
body: <p>I'm using ESLint in vscode with option <code>"eslint.autoFixOnSave": true</code>.</p>
  
  <p>Basically, I want:</p>
  
  <ol>
  <li>Ignore 1 particular rule <strong>for fixing</strong>: <a href="http://eslint.org/docs/rules/prefer-const" rel="noreferrer">prefer-const</a> </li>
  <li>See all the warnings and errors highlighted in editor (including <code>prefer-const</code>)</li>
  </ol>