title: How to Revert form data to `initialValues`
body: <p>I have a form that allows the user to do a bunch of things like adding, deleting, modifying. The form takes a bunch of data from the state as <code>initialValues</code> and I have a requirement for an "Undo" button that reverts all the modifications back to how they were when <code>initialValues</code> was set.</p>
  
  <p>Is there something built into redux-form that can do this? We're using v5.3.3</p>