message: Use KeyboardDatePicker for formik integration example
diff: @@ -2,12 +2,12 @@ import React from 'react';
  import Code from '../../_shared/Code';
  import { Grid } from '@material-ui/core';
  import { Formik, Form, Field } from 'formik';
  -import { DatePicker } from '@material-ui/pickers';
  +import { KeyboardDatePicker } from '@material-ui/pickers';
  const DatePickerField = ({ field, form, ...other }) => {
  const currentError = form.errors[field.name];
  return (
  - <DatePicker
  + <KeyboardDatePicker
  clearable
  disablePast
  name={field.name}
  @@ -16,7 +16,7 @@ const DatePickerField = ({ field, form, ...other }) => {
  helperText={currentError}
  error={Boolean(currentError)}
  onError={(_, error) => form.setFieldError(field.name, error)}
  - onChange={date => form.setFieldValue(field.name, date, true)}
  + onChange={date => date && form.setFieldValue(field.name, date, true)}
  {...other}
  />
  );
  