message: docs: Update prop name
  Update README.md
  Update prop name
diff: @@ -28,7 +28,7 @@ function SampleSpring() {
  return (
  <>
  <Button onClick={onToggle}>Click</Button>
  - <Collapse isOpen={isOpen}>
  + <Collapse in={isOpen}>
  Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus
  terry richardson ad squid. Nihil anim keffiyeh helvetica, craft beer
  labore wes anderson cred nesciunt sapiente ea proident.
  @@ -48,7 +48,7 @@ function Example() {
  return (
  <>
  - <Collapse startingHeight={20} isOpen={show}>
  + <Collapse startingHeight={20} in={show}>
  Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus
  terry richardson ad squid. Nihil anim keffiyeh helvetica, craft beer
  labore wes anderson cred nesciunt sapiente ea proident.
  