Are you submitting abug report or afeature request?

Bug report

What is the current behavior?

Ifrequired prop is initiallytrue, then the validate function continues to require the field to be filled in, even if you later change therequired prop tofalse.

What is the expected behavior?

As soon asrequired prop changes, validation checks should reflect that that. So if you change it tofalse, the field should no longer be required.

Sandbox Link

https://codesandbox.io/s/react-final-form-html5-validation-example-n2q8d

Other information

Likely related to#13