PropType warnings for not required props

[daryaskopyuk]

In the latest version of rheostat I receive prop type warnings for not required props that are not passed to <Rheostat /> component. These props are: handle, background, progressBar.

For example, for the component...

<RangeSlider
   min={0}
   max={100}
   values={[min, max]} 
   snap={true}
/>

...there are warnings like this:

As far as we investigated this issue, these warnings appear when react-with-styles dependency has version 4.2.0. When we pin it to 4.1.0 warnings are not present.

[Jordan Harband]

cc @noratarano @lencioni; v4.2.0 of react-with-styles caused breaking changes in react-dates, and appears to be doing the same here. can someone look into that?