title: Fields in redux form returns a value of undefined
body: <p>i've implememt a submission form using redux-form:</p>
  
  <pre><code>import { reduxForm } from 'redux-form/immutable';
  const Filters = ( {fields: {symbol, side, status}} ) =&gt; {
      console.log(side);
  
  export default reduxForm({
    form: 'FiltersAccounts',  // a unique identifier for this form
    fields: ['symbol', 'side', 'status']
  })(Filters);
  </code></pre>
  
  <p>Why the console.log shows me undefined? Am i missing something??</p>