Export the `toStyleSheet` function

[TikiTDO]

This function could be useful in a ReactNative app when doing something like this:

<ScrollView contentContainerStyle={[reactNativeStyles.flexSingle]}>
   ...

At the moment we have to keep a part of our styles config using StyleSheet.create because there's a few places that are not handled by the styled-component magic interpolation.

If this function was available to import, then it would allow us to use the same styling rules everywhere.

If this is acceptable then I can submit a PR.

[krudos]

you can use like this

import {toStyleSheet} from 'styled-components/native';

[TikiTDO]

@krudos Are you sure about that?

I tried checking if it's just the types, but even ignoring the type errors I don't see that sort of import:

[TikiTDO]

Ah, I'm out of date. That would do it.