add `react-native-web` support

[sarvarrose]

For projects that use RN + react-native-web for their web applications, the styling for the input label gets broken. The label is pushed to the left of the parent container out of the bounds of the input.

It is not possible to pass separate styles for the label as the label component's render method does not accept any such prop for styling.

react-native-web github: https://github.com/necolas/react-native-web

[sarvarrose]

Fixed by #346

[SergioGeeK7]

Can we close this ?

[sarvarrose]

@SergioGeeK7 #346 was closed not merged so this is still an issue.

I can reopen #346 if you want if there's a scope for merging this.