add style props to readme

Author: skv-headless

README.md

@@ -78,6 +78,7 @@ See
 - **`tabBarBackgroundColor`** _(String)_ - color of the default tab bar's background, defaults to `white`
 - **`tabBarActiveTextColor`** _(String)_ - color of the default tab bar's text when active, defaults to `navy`
 - **`tabBarInactiveTextColor`** _(String)_ - color of the default tab bar's text when inactive, defaults to `black`
+- **`style`** _([View.propTypes.style](https://facebook.github.io/react-native/docs/view.html#style))_
 
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