Is there any way to dynamically set a new tab bar icon AND color?
In my app, I want the icon for the CHAT tab to be changed to red when a new message arrives.

Steps to Reproduce / Code Snippets / Screenshots

```
    this.props.navigator.setTabButton(
        {
                tabIndex: 2,
                screen: 'parkour.ChatListScreen',
                title: 'Chat',
                icon: iconsMap[2],
                style: { color: 'red' }
        },

```

the style property does not work at all, the resulting color is yellow.

I a using react native navigation v.1.