message: iOS: Disabled drawer slide gesture
diff: import React from 'react';
  +import { Platform } from 'react-native';
  import { StackNavigator, DrawerNavigator, NavigationActions, HeaderBackButton } from 'react-navigation';
  import Sidebar from '../../containers/Sidebar';
  @@ -76,7 +77,10 @@ const Routes = DrawerNavigator(
  },
  {
  contentComponent: Sidebar,
  - drawerPosition
  + drawerPosition,
  + navigationOptions: {
  + drawerLockMode: Platform.OS === 'ios' ? 'locked-closed' : 'unlocked'
  + }
  }
  );
  