message: fix(spinner): typo in README
diff: @@ -60,7 +60,7 @@ Change the background color of the spinner by passing the `emptyColor` prop.
  Change the spinner's animation speed area by passing the `speed` prop. The unit
  of the value matches the
  -[`animation-duration CSS property`](https://developer.mozilla.org/en-US/docs/Web/CSS/animation-duration)
  +[`animation-duration` CSS property](https://developer.mozilla.org/en-US/docs/Web/CSS/animation-duration)
  property.
  ```jsx
  