validationPaused is blocking notifications from firing as expected

### Are you submitting a **bug report** or a **feature request**?

bug report

### What is the current behavior?

Performance impromenents introduced in https://github.com/final-form/final-form/pull/118 are blocking notifications

### What is the expected behavior?

Notifications should reach regardless of validation state

### Sandbox Link

https://codesandbox.io/s/vvmk4xz660

### Other information

Thought I'd make an issue out of the discussion on the PR :)