Custom styles (padding, etc)

[crazy4groovy]

I like the component, thanks! But with a substantial amount of text, the margins/padding look too cramped.

I'm looking at the style def here: https://github.com/beefe/react-native-popup/blob/master/index.js#L325

I'd like to be able to modify various styles in the component. Have you thought about a way to do this? Would you like a PR?

[crazy4groovy]

(simple solution for me right now is just to add marginHorizontal: 10, I think...)

[SebPez]

@crazy4groovy I had the same issue, and did the same thing.