Checkboard: Support for defaultProps will be removed from function components
I came across this error while using the ChromePicker;
```
Warning: Checkboard: Support for defaultProps will be removed from function components in a future major release. Use JavaScript default parameters instead.
    at Checkboard (webpack-internal:///(app-pages-browser)/./node_modules/react-color/es/components/common/Checkboard.js:16:20)
```
is it just me?