title: navigationOptions headerLeft,headerRight and title not working?
body: <p>What I want: put a touchable icon left side that will navigate to my drawer navigator once pressed and the title in the middle then in the right side an icon that has future purposes once clicked</p>
  
  <p>What I tried doing: 
  I tried to put the navigationOptions under the MainScreen it still doesn't work. </p>
  
  <p>This is my code in my AppNavigation.js </p>
  
  <pre><code>    const primaryNav = createStackNavigator({
      LaunchScreen: { screen: LaunchScreen },
      MainScreen: {
      screen: MainScreen,
      },
      }, {
      // Default config for all screens
      headerMode: 'none',
      initialRouteName: 'MainScreen',
      navigationOptions: {
      headerStyle: styles.header,
      title: 'TY, Next',
         headerStyle:{
         backgroundColor: "Transparent",
         marginRight: 20,
         marginLeft: 20,
      },
      headerRight: (
         &lt;TouchableOpacity&gt;
          &lt;Icon2 name="sc-telegram" color={Colors.red} size={30} /&gt; 
         &lt;/TouchableOpacity&gt;
      ),
      headerLeft: (
          &lt;TouchableOpacity&gt;
          &lt;Icon name="bars" color={Colors.red} size={25}/&gt;
           &lt;/TouchableOpacity&gt;
      ),
   }
  })
  </code></pre>
  
  <p>Any idea why my code isn't running? There's no title of Ty next not even the 2 icons that I added. I am using igniteCLI for react native. </p>