final-form / final-form/react-final-form

Custom Validation Engine example is broken

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Dominant language
JavaScript
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Description

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

### What is the current behavior?
The Custom validation engine example is broken.
1. Type something in any field
2. Blur the field
3. App crashes with error: ```TypeError
mutators.setFieldData is not a function```

### What is the expected behavior?
The UI shows the validation.

### Sandbox Link
https://codesandbox.io/s/kxxw4l0p9o

Contributor guide

Open the contributing guide

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