title: Cannot able to import FieldInputProps react-final-form
body: <p>Trying to set actual propTypes. But show error like this</p>
  <blockquote>
  <p>Attempted import error: 'FieldInputProps' is not exported from 'react-final-form'.</p>
  </blockquote>
  <pre><code>import { FieldInputProps, FieldMetaState } from 'react-final-form';
  
  const TextInput = ({
    input: { name, onChange, value, type = 'text', placeholder, ...restInput },
    meta
  }) =&gt; {
    .....Some Component Functionality.....
  };
  
  TextInput.propTypes = {
    input: FieldInputProps,
    meta: FieldMetaState
  }
  </code></pre>
  <p>Am not sure why this happens, how to fix it?</p>