Ability to use prop values in mapToTheme

[mmartinsky]

I think it's similar to #8 , but it would be nice to be able to use the prop value rather than just prop key in mapToTheme.

So mapToTheme would become something like:

export const mapToTheme = (themeKey, propValue) => 

Ideal Example:

const theme = {
    color: {
        primary: '#086ea1',
        success: '#178c5b',
        warning: '#D9822B',
        danger: '#DB3737',
    },
};

const StyledButton = styled.button`
    color: ${mapToTheme('color', 'kind')};
`}

<Button kind='success' />

I'd be happy to submit a PR if you agree this would be helpful

[sergeylaptev]

Any updates on this?

[mmartinsky]

Added a PR in #19, please let me know what you think @scf4 ?

[smoliakov]

Definitely very useful feature, please, include in next release @scf4

[scf4]

Will include in next release after reviewing the PR, thanks @mmartinsky