title: How to reset / empty form after submit in Formik
body: <p>So I've got my form. And I simply want it to be empty after the submit is successfull.</p>
  
  <p>I've seen that I should be using <code>enableReinitializing</code> and change the value manually like : <code>this.values.content = ""</code>.</p>
  
  <p>But I'm not managing to understand where can I put this option?</p>
  
  <pre><code>&lt;Formik
      enableReinitializing //This is not working
      initialValues={{
          content: "",
      }}
      validationSchema={validAddMessageToProjectSchema(
          this.props.intl.locale
      )}
      validateOnBlur={true}
      onSubmit={ async ( values: AddMessageToProjectFormValue,
          { setSubmitting }: any
      ) =&gt; { await mutate({ variables: values });
          setSubmitting(false);
      }}
  &gt;
      {({ isSubmitting, values, errors, touched, setFieldValue }) =&gt; {
          return (
              &lt;Form className="addMessageToProject-form"&gt;
                  &lt;div&gt;
                      &lt;FormattedMessage
                          id="addMessageToProject.descriptionField"
                          defaultMessage="Describe your post"
                      &gt;
                          {msg =&gt; (
                              &lt;Field
                                  name="content"
                                  placeholder={msg}
                                  component={
                                      TextAreaField
                                  }
                              /&gt;
                          )}
                      &lt;/FormattedMessage&gt;
                  &lt;/div&gt;
  
                  &lt;Button
                      type="primary"
                      htmlType="submit"
                      className="addMessageToProject-form__submit form-submit"
                      disabled={isSubmitting}
                  &gt;
                      &lt;FormattedMessage
                          id="addMessageToProject.button"
                          defaultMessage="Send Message"
                      /&gt;
                  &lt;/Button&gt;
              &lt;/Form&gt;
          );
      }}
  &lt;/Formik&gt;
  </code></pre>
  
  <p></p>