Make component displayName the same as named exports
For example, the `ChromePicker` component's displayName is `Chrome`. Guess it would be better to keep the same name across. This should be helpful while writing tests of components that include one of these pickers. I was trying to assert if my component was rendering `ChromePicker` and spent a good few minutes before figuring out that the actual display name of the component is `Chrome`. 

Happy to make a PR if this makes sense.