Type for delay argument in README is inaccurate

[vmerino]

Hello 👋

I noticed the README contains a typescript declaration of:

useInterval(
  callback: () => void,
  delay: number,
  immediate?: boolean /* called when mounted if true */
)

If I'm not mistaken, the delay type should be delay: number | null | false

useInterval(
  callback: () => void,
  delay: number | null | false,
  immediate?: boolean /* called when mounted if true */
)

I tried to submit a pull request to fix it but I received a permission denied error. Thanks!