title: Formik dispatch Redux action after valid field change
body: <p>I've built this sandbox React application that uses Formik forms.</p>
  
  <p>I want to dispatch a Redux action if the email field validation fires and is valid.
  I want to dispatch the action to do some lookup from the users email. This action will update redux state and populate some other field on my form.</p>
  
  <p>So this dispatch would happen if the email field was valid. The other fields could be invalid and I haven't submitted the form yet.</p>
  
  <p>How do I do that? I can't find any documentation on this!</p>
  
  <p><a href="https://codesandbox.io/s/x32yoo242q" rel="nofollow noreferrer">https://codesandbox.io/s/x32yoo242q</a></p>
  
  <p>Thanks!</p>