title: In formik, shorthand input field is not working
body: <p>In Formik, I try to use {...formik.getFieldProps('email')} on my input field
  instead of using value, onChange, and onBlur. But it's not working.</p>
  
  <p>This works :</p>
  
  <pre class="lang-js prettyprint-override"><code>&lt;input id="email" name="email" type="text" value={formik.values.email} onChange={formik.handleChange} onBlur={formik.handleBlur} /&gt;
  </code></pre>
  
  <p>But this doesn't :</p>
  
  <pre class="lang-js prettyprint-override"><code>&lt;input id="email" type="text" {...formik.getFieldProps("email")} /&gt;
  </code></pre>
  
  <p>Code is here : <a href="https://codesandbox.io/s/formik-pb-with-getfieldprops-83tze?fontsize=14" rel="nofollow noreferrer">https://codesandbox.io/s/formik-pb-with-getfieldprops-83tze?fontsize=14</a></p>
  
  <p>Any ideas ?
  Thanks !</p>