text: import { createAppContainer } from 'react-navigation';
  import { createStackNavigator } from 'react-navigation-stack';
  
  import Main from './pages/Main';
  import Profile from './pages/Profile';
  
  const Routes = createAppContainer(
    createStackNavigator({
      Main: {
        screen: Main,
        navigationOptions: {
          title: 'DevRadar'
        },
      },
      Profile: {
        screen: Profile,
        navigationOptions: {
          title: 'Perfil no Github'
        }
      },
    },{
      defaultNavigationOptions: {
        headerTitleAlign: "center",
        headerBackTitleVisible: false,
        headerTintColor: '#FFF',
        headerStyle: {
          backgroundColor: '#7D40E7',
        },
      }
    })
  );
  
  export default Routes;