I got an warning in react 16.2.0

[cyl]

use：

<InfiniteCalendar
  Component={withMultipleDates(Calendar)}
  selected={[
    new Date(2018, 3, 12),
    new Date(),
    new Date(2018, 3, 29)
  ]}
  interpolateSelection={defaultMultipleDateInterpolation}
/>

[stereobooster]

This PR should solve it #197