message: update Position component to work with Now
diff: @@ -5,10 +5,7 @@ export const Position = withSystemProps('div', LAYOUT.concat(POSITION))
  function withPosition(position) {
  const WithPosition = props => <Position {...props} position={position} />
  - WithPosition.defaultProps = {...Position.defaultProps}
  - delete WithPosition.defaultProps.position
  - WithPosition.propTypes = {...Position.propTypes}
  - delete WithPosition.propTypes.position
  + WithPosition.propTypes = Position.propTypes
  WithPosition.displayName = `Position.${position}`
  return WithPosition
  }
  @@ -17,7 +14,7 @@ export const Absolute = withPosition('absolute')
  export const Fixed = withPosition('fixed')
  export const Relative = withPosition('relative')
  export const Sticky = withPosition('sticky')
  -Object.assign(Sticky.defaultProps, {
  +Sticky.defaultProps = {
  top: 0,
  zIndex: 1
  -})
  +}
  