title: activeTintColor Not changing Icon Color in react-navigation
body: <pre><code>    HomeStack.navigationOptions = {
      tabBarLabel: 'Home',
      tabBarIcon: ({ focused }) =&gt; (
          &lt;TabBarIcon
              focused={focused}
              name={Platform.OS === 'ios' ? 'ios-home' : 'md-home'}
  
          /&gt;
      ),
      tabBarOptions: {
          activeTintColor: '#cd077d',
  
      },
  };
  </code></pre>
  
  <p>I'm trying to change the color of my <strong>TabBarIcon</strong> I have tried the ActiveTintColor but this just seems to change the text color and not the icon color, its currently the default Blue when active. </p>