message: Fixed a casing issue in apply validation example
  maxlength => maxLength
diff: @@ -204,7 +204,7 @@ export default function App() {
  return (
  <form onSubmit={handleSubmit(onSubmit)}>
  - <input name="firstName" ref={register({ required: true, maxlength: 20 })} />
  + <input name="firstName" ref={register({ required: true, maxLength: 20 })} />
  <input name="lastName" ref={register({ pattern: /^[A-Za-z]+$/i })} />
  <input name="age" type="number" ref={register({ min: 18, max: 99 })} />
  <input type="submit" />
  